A ball of mass 0.5 kg moving with a velocity of 2 ms -1 strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and wall is 10-3 s, the average force exerted by the wall on the ball is

Question

A ball of mass 0.5 kg moving with a velocity of 2 ms -1 strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and wall is 10-3 s, the average force exerted by the wall on the ball is (A) 1125 N (B) 1000 N (C) 500 N (D) 2000 N

Tardigrade Admin · Accepted Answer

Impulse =m v -(-m v) =0.5 × 2-(-0.5 × 2)=2 Hence, F =(2/10-3)=2000 N

Q. A ball of mass $0.5 k g$ moving with a velocity of $2 m s^{- 1}$ strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and wall is $1 0^{- 3} s$ , the average force exerted by the wall on the ball is

1125 N

1000 N

500 N

2000 N

Impulse $= m v - (- m v)$
$= 0.5 \times 2 - (- 0.5 \times 2) = 2$
Hence, $F = \frac{2}{1 0 ^{- 3}} = 2000 N$

Q. A ball of mass 0.5kg moving with a velocity of 2ms−1 strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and wall is 10−3s, the average force exerted by the wall on the ball is