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Could someone help me with a physics problem?

A stationary refrigerator car with a mass of 20000kg is rammed by a loaded gondola car with a mass of 30000kg. Before impact, the gondola car was going 1.0m/s. If they lock together, what is the new velocity?

Could someone explain how to do this question, I'm not really sure which formula to use on it.

It is simply a conservation of momentum problem. The two objects stick together, thus it is an inelastic collision, and we need not worry about conserving any other quantity than momentum.

Call the gondala car object 1, and call the refrigerator car object 2.

Conservation of momentum for an inelastic collision:
m1*v1i + m2*v2i = (m1 + m2)*vf

Because refrigerator is initially at rest, v2i = 0 thus:
m1*v1i = (m1 + m2)*vf

Solve for vf:
vf = m1*v1i/(m1 + m2)

Data:
m1:=30000 kg; m2:=20000 kg; v1i:=1 m/s;

Result:
vf = 0.6 meters/second

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MARKLIN H0 4535 Refrigerator Beer Car SBB CFF BELL EXC
MARKLIN H0 4535 Refrigerator Beer Car SBB CFF BELL EXC
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TRAIN HO SCALE LIMA ITALY LIBBYS FAMOUS FOODS  NYMX 1020 REFRIGERATOR CAR LOT
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HO Scale ROCO Austria Pacific Fruit Express 40 foot Refrigerator Car VGUC
HO Scale ROCO Austria Pacific Fruit Express 40 foot Refrigerator Car VGUC
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Vtg HO Scale Revelle 1956 Refrigerator Car MDTNew York Central 4015 Used
Vtg HO Scale Revelle 1956 Refrigerator Car MDTNew York Central 4015 Used
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Model Power HO 41 Steel Refrigerator Car Lehigh Valley Route Map MTA733307
Model Power HO 41 Steel Refrigerator Car Lehigh Valley Route Map MTA733307
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RIVAROSSI VINTAGE HO 52 CARRO REFRIGERATOR CARINTERFRIGOMINT BOXED
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Tyco HO Swift Refrigerator Box Car 329A250 Excellent Condition
Tyco HO Swift Refrigerator Box Car 329A250 Excellent Condition
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TYCO BROWN BOX HO SCALE 329C 250 ARMOUR 40 FOOT REFRIGERATOR CAR MODEL TRAIN D
TYCO BROWN BOX HO SCALE 329C 250 ARMOUR 40 FOOT REFRIGERATOR CAR MODEL TRAIN D
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Athearn HO Pacific Fruit Express Refrigerator Car Kit
Athearn HO Pacific Fruit Express Refrigerator Car Kit
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HO Athearn Burlington Zephyrs Reefer Refrigerator Car 74219 Kadee coupler
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HO Athearn Illinois Central Reefer Refrigerator Car 50300 Kadee coupler
HO Athearn Illinois Central Reefer Refrigerator Car 50300 Kadee coupler
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HO VTG MANTUA ARMOUR REFRIGERATOR LINE REEFER CAR 1754
HO VTG MANTUA ARMOUR REFRIGERATOR LINE REEFER CAR 1754
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HO Scale American Refrigerator Transit ART 36016 Freight Train Car Athearn
HO Scale American Refrigerator Transit ART 36016 Freight Train Car Athearn
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HO Scale Burlington Refrigerator Express Box Car BREX 67170 40 Footer
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Athearn HO Scale REA Railway Express Refrigerator Car Kit 1977
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Accurail HO 8096 Northern Refrigerator Car Company 3 Car Set
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TYCO HO Swift Refrigerator Line SRLX 4226 Wood side Reefer Car EUC
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HO LIFE LIKE WILSONS  SWIFT REFRIGERATOR LINE WOOD REEFERS LOT FOUR 4 CARS
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Atlas 6101 Wood Refrigerator Car 36 Undecorated Side Ladderl New in Box
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HO Refrigerator Cars Set of 2
HO Refrigerator Cars Set of 2
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Northeastern Scale Models UNICEL Refrigerator box car NOS C 7
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RARE VINTAGE NIB Walthers refrigerator car 6815
RARE VINTAGE NIB Walthers refrigerator car 6815
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32 HO Scale Assembled Train Freight Cars w Refrigerator Car
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Red Caboose RR 31012 5 Raskin Packing Co Mather Meat Refrigerator Car 5466
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HO Roundhouse ATCHISON TOPEKA  SANTA FE 36 Refrigerator Car 850 Kadees
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Microscale HO Scale 87 890 Merchants Dispatch Refrigerator Cars Decals
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Microscale Decal HO 87 501 PFE Refrigerator Car Ice 40 1950 1960
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BURLINGTON REFRIGERATOR EXPRESS BOX CAR HO SCALE
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HO Train Custom Built Weathered Wood Sheathed American Refrigerator Car T24
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HO Scale Burlington Refrigerator Express BREX 75226 40 Freight Train Box Car
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HO Roundhouse ATSF Santa Fe White 40 Reefer Refrigerator Car 7878
HO Roundhouse ATSF Santa Fe White 40 Reefer Refrigerator Car 7878
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Industrial rail HO scale Swift refrigerator line freight car ALEX 6714
Industrial rail HO scale Swift refrigerator line freight car ALEX 6714
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