A 1 270.0 kg car traveling initially with a speed of 25.000 m/s in an easterly d

Question

A 1 270.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 8 400.0 kg truck moving in the same direction at 20.000 m/s. The velocity of the car right after the collision is 18.000 m/s to the east. What is the velocity of the truck right after the collision? (Give your answer to five significant figures.) m/s east What is the change in mechanical energy of the car-truck system in the collision? Account for this change in mechanical energy. This answer has not been graded yet.

Explanation / Answer

m1v1+m2v2=m1v1'+m2v2' 1270(25)+8400(20)=1270(18)+8400(v2') 31750+168000=22860+8400v2' 199750-22860=8400v2' 176890/8400=v2' 21.05=v2' b)no change in mechanical energy

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