Laws Of Motion Question 36

Question: A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30° 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[CPMT 1997]

Options:

A)10 N

B) 100 N

C) 1.0 N

D) 0.1 N

Show Answer

Answer:

Correct Answer: A

Solution:

During collision of ball with the wall horizontal momentum changes (vertical momentum remains constant) $ \therefore $ $ F=\frac{\text{Change in horizontal momentum }}{\text{Time of contact}} $

$ =\frac{2P\cos \theta }{0.1}=\frac{2mv\cos \theta }{0.1} $

$ =\frac{2\times 0.1\times 10\times \cos 60{}^\circ }{0.1} $

$ =10\ N $



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