Laws Of Motion Question 257

Question: A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall [BCECE 2005]

Options:

A) $ \frac{2mv}{t} $

B) $ \frac{mv}{t} $

C) $ mvt $

D) $ \frac{mv}{2t} $

Show Answer

Answer:

Correct Answer: A

Solution:

For exerted by ball on wall = rate of change in momentum of ball = $ \frac{mv-(-mv)}{t}=\frac{2mv}{t} $



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