Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Physics Laws of Motion Newton's Laws of Motion
A ball of mass 200 gm is moving with a speed of 30 m/s. When it strikes to a wall, it returns back to the same path with the same speed. If the contact time between the ball and the wall is 0.2 sec, the force exerted by the ball on the wall is:
1
60 N
2
120 N
3
30 N
4
More than one of the above
5
None of the above