Work Energy And Power Question 109
Question: A ball hits a vertical wall horizontally at 10m/s bounces back at 10 m/s [JIPMER 1999]
Options:
A) There is no acceleration because $ 10\frac{m}{s}-10\frac{m}{s}=0 $
B) There may be an acceleration because its initial direction is horizontal
C) There is an acceleration because there is a momentum change
D) Even though there is no change in momentum there is a change in direction. Hence it has an acceleration
Show Answer
Answer:
Correct Answer: C
Solution:
As the ball bounces back with same speed so change in momentum = 2 mv
and we know that force = rate of change of momentum
i.e. force will act on the ball so there is an acceleration.
