Subject :NSO Class : Class 9
A mass of 100 g strikes the wall with speed 5 m/s at an angle as
shown in figure and it rebounds with the same speed. If the contact time is 2 x 10-3 sec, what is the force applied by the wall ?
(A) 
to right
(B) 250 N to right
(C) 
to left
(D) 250 N to left