Question

A tennis player returns, with his racket, a tennis ball
mass 100 g coming towards him with a speed of
160 km h-1. If the ball returns with the same speed
and it remains in contact with racket for 0.1 s, find
the force exerted by him on the ball.
HINT IS GIVEN IN ABOVE IMAGE question 56


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Answer 1

$\underline{ \huge \boxed{ \bold{ \mathfrak{ \purple{Answer}}}}}$

Given :

mass of ball = 0.1 kg

initial velocity = 44.44 m/s

final velocity = -44.44 m/s (opposite)

time interval = 0.1 s

To Find :

Force exerts by rackrt on ball.

Formula :

As per Newton's second law of motion..

$\: \: \: \: \dag \: \underline{ \boxed{ \bold{ \rm{ \pink{F = \frac{ \triangle{P}}{ \triangle{t}} = \frac{m(v - u)}{ \triangle{t}}}}}}} \: \dag$

Calculation :

$\implies \rm \: F = \frac{0.1( - 44.44 - 44.44)}{0.1} = - 88.88 \: N \\ \\ \therefore \: \underline{ \boxed{ \bold{ \rm{ \orange{F ≈ - 90 \: n}}}}} \: \red{ \clubsuit}$