A car, mass m1 is moving to the right on a frictionless air track. It collides w

Question

A car, mass m1 is moving to the right on a frictionless air track. It collides with a second car, mass m2, which is initially at rest. Which of the following statements are true? (If A and E are true, and the others are not, enter TFFFT). A) Suppose (for this statement only) that car 2 was NOT initially at rest, but was instead heading towards car 1 with equal (but opposite) momentum before the collision. After the collision, the cars must both be at rest. B) If car 1 sticks to car 2, the final total kinetic energy of the car1-car2 system is less than the initial total kinetic energy of the two cars. C) If car 1 is much lighter than car 2, and the collision is perfectly elastic, car 1 will be heading back to the left with nearly its original speed after the collision. D) If the collision is elastic, car 1 must always come to a stop after the collision. E) If car 1 sticks to car 2, the car1-car2 system must move to the right after the collision.

Explanation / Answer

a) true b) true c) false d) true e) false

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