A body of mass 20kg is moving with an initial velocity of 4m/s.How long would a constant force of 5N acting on the body take to double it's kinetic energy.
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Answer:
16seconds
Explanation:mass of the body,M=20kg
Force,F=5N
KINETIC ENERGY=MV squared divide by 2
work done=force time distance=change in kinetic energy
to double it kinetic energy we have;
MVsquared=FD
20*4*4=5D
D=64M
X=VT
64=4T
T=16Sec
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