An object of mass 2kg is moving with constant velocity of 4 metre per second one on a frictionless horizontal surface. if the object is to be kept moving with the same velocity the magnitude of the external force required would be
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Answer:4 newton
A->B
4=4m/s v=0 t=2sec a=?
V=u+at
0=4+a(2)
a=-2m/s^2 ,so force =ma
=2×2=4N
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