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# A 1,160-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9,900-kg truck?

A 1,160-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9,900-kg truck moving in the same direction at 20.0 m/s. The velocity of the car right after the collision is 18.0 m/s to the east.

a What is the velocity of the truck right after the collision?

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- sojsailLv 712 months agoFavorite Answer
Momentum is conserved.

Momentum before = Momentum after

1160 kg*25 m/s + 9900 kg*20 m/s = 1160 kg*18 m/s + 9900 kg*v

Solve for v: 20.82 m/s (based on a one-time run thru. You should run the numbers to confirm.)

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