Question

A ball of mass $0.15$ $kg$ hits the wall with its initial speed of $12$ $ms^{–1}$ and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is $100$ $N$, calculate the time duration of the contact of ball with the wall.

• A. 0.018 s
• B. 0.036 s
• C. 0.009 s
• D. 0.072 s

Answer 1

Answer: (B)

0.036 s

Answer 2

Force applied by the wall on the ball during the contact is = $100$ $N$

$\Rightarrow$ $ΔP = 2 × 0.15 × 12$

$= 3.6$

Hence, $t = \frac{3.6}{100}$

= $0.036$ $s$

Hence, the correct option is (B): $0.036\;s$