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From classical mechanics to quantum field theory, momentum is the Universe's preferred language to describe motion. Learn here about momentum, its conservation, and how it captures our intuitions.

A \(66\text{ kg}\) stuntman jumps out of a window that's \(5\text{ m}\) above the ground. When he hits the ground, the impulse time between him and the ground is \(2\text{ s}.\) What is the average force delivered to the man by the ground during the impulse?

Ignore any air resistance, and assume that gravitational acceleration is \(g=10\text{ m/s}^2.\)

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A ball of mass \(1\text{ kg}\) is dropped straight downward from a \(20\text{ m}\) high rooftop. After the ball hits the ground, it bounces back in the air up to \(5\text{ m},\) and then starts to fall again. If the impact time between the ball and the ground is \(50\text{ ms},\) what is the magnitude of the average force exerted by the ground on the ball?

Ignore any air resistance, and assume that gravitational acceleration is \(g=10\text{ m/s}^2.\)

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