A 328-kg car moving at 19.1 m/s in the +x direction hits from behind a second car moving at 13.0 m/s in the same direction. If the second car has a mass of 790 kg and a speed of 15.1 m/s right after the collision, what is the velocity of the first car after this sudden collision?
A) 14.0 m/s
B) 18.2 m/s
C) -14.0 m/s
D) 24.2 m/s

Question

A  328-kg car moving at  19.1 m/s in the  +x  direction hits from behind a second car moving at  13.0 m/s in the same direction. If the second car has a mass of  790 kg and a speed of  15.1 m/s right after the collision, what is the velocity of the first car after this sudden collision?
A)  14.0 m/s
B)  18.2 m/s
C)  -14.0 m/s
D)  24.2 m/s

Quizplus · Accepted Answer

Using the conservation of momentum: (328 kg * 19.1 m/s) + (790 kg * 13.0 m/s) = (328 kg * v) + (790 kg * 15.1 m/s). Solving for v gives approximately 14.0 m/s.

A 328-Kg Car Moving at 19