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} $
