Question

A 100 g iron ball having 10 m/s collides with a wall at an angle ${30}^o$ and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is

• A. 10 N
• B. 100 N
• C. 1.0 N
• D. 0.1 N

Answer 1

The correct option is A 10 N

when ball collides with a wall the force exert a F as shown in the figure

let take elastic collision between the ball and wall.

$\Rightarrow F=m\frac{\partial v}{\partial t}=\frac{0.1(vsin{30}^0-(-vsin{30}^0)}{0.1}=\frac{.1\times 2\times 10\times \frac{1}{2}}{0.1}=10N$

Hence the A option is correct.