An NFL place kicker is practicing his extra-point kicks He kicks the football into the wall of his living room and it hits at a speed 371 m/s If the wall did not move at all how fast would the ball bounce back? (Assume a perfectly elastic collision and ignore friction.) Note: Type your answer as speed in m/s.

Question

An NFL place kicker is practicing his extra-point kicks He kicks the football into the wall of his living room and it hits at a speed 371 m/s If the wall did not move at all how fast would the ball bounce back? (Assume a perfectly elastic collision and ignore friction.) Note: Type your answer as speed in m/s.

Answer 1

In a perfectly elastic collision with an immovable object, the speed of the object after the collision is equal to the speed before the collision, but in the opposite direction. Therefore, the football would bounce back at a speed of 371 m/s.

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