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A body of mass 5 kg initially at rest is subjected to a force of 20N What is kinetic energy acquired by the body at the end of 10s?
Arihantbhandari
By Newton second law,
F=ma;
20=5*a;
or a=4m/s/s.
initial velocity=0
and time=10s
so by first equation of motion
V=0+at, so
V=4*10=40m/s,
so kinetic energy of body=K.E=1/2*m*V2 = 0.5*5*1600=25*160=.....
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∙ 13y ago
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