1.

A body of mass 2 kg collides with a wall with speed 100 m/s and rebounds with same speed. If the time of contact was 1/50 second, the force exerted on the wall is [CPMT 1993]

A.          8 N                                
B.          \[2\times {{10}^{4}}\,N\]
C.          4 N                                
D.          \[{{10}^{4}}\,N\]
Answer» C.          4 N                                


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