7. On a serve, a tennis ball may leave the tennis racket of a top player...

Question

Question

Answer 1

Answer #1

By impulse-momentum theorem,

Impulse = change in momentum

=> F*t = mv

=> F = mv/t

=> F = 0.0600*65/0.0300

= 130 N (answer)

Weight of the person = mg = 75*9.8 = 735 N

F is less than the weight so it is not enough to lift that person.

Answer 2

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