1.

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 sec. If one wants to keep this body moving on the same surface with a velocity of 4 m/sec, the force required is            [NCERT 1977]

A.                         8 N                 
B.                         4 N            
C.                         Zero                
D.                         2 N
Answer» C.                         Zero                


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