2Chainz is kicked horizontally off a cliff. You notice that he takes 7 seconds to hit the ground, and lands 30 m from the base of the cliff. How fast was he going right after he was kicked (at the top of the cliff)? (answer in m/s)

Amoving freight car collides with an identical one that is at rest. if momentum is conserved, what happens to the second car after the collision? it attains the same speed as the first car. it moves at half the speed of the first car. it moves at twice the speed of the first car.