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

The Correct Option is B

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): \(0.036\;s\)