A 
ball moving with a speed of 12m/s strikes a hard wall at an angle of 
with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is
A
96 
B
48 
C
24 
D
12 N.
Text Solution
Verified by ExpertsThe correct answer is:
C
: Components of momentum parallel to the wall add each other and components of momentum in the perpendicular to the wall are opposite to each other. Therefore change of
momentum is final momentum ‐ initial momentum
i. e., 
after 
before collision) 
change in momentum 
N.
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