A Railway Car Having a Total Mass of 5 $\times$ 10⁵ Kg,moving with a Speed of 9

question 7

Multiple Choice

A railway car having a total mass of 5.8 $\times$ 10⁵ kg,moving with a speed of 9.1 km/h,strikes another car that has a mass of 8.7 $\times$ 10⁵ kg and is initially at rest.The speed of the coupled cars after the collision is

• A)9.1 km/h
• B)7.2 km/h
• C)3.6 km/h
• D)1.8 km/h
• E)4.2 km/h

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