Question

on a highway a car of mass 1500kg is stopped at traffic signal. a pickup of mass 2000 kg comes up from behind and hits the stopped car. Assuming the collision is elastic, the picup stops with collision and push the car ahead onto the highway at 10 m/s. How fast was the picup going just before the collision

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Answer 1

Answer:

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Answer 2

Answer:

7.5m/s

Explanation:

m1=1500kg m2=-2000kg and u1=10m/s u2=? m1u1+m2u2=0. U2=-m1u1/m2. - 1500*10/-2000=7.5m/s