A body of mass 5 kg initially at rest is subject
of a force of 20 N. What is the kinetic energy
acquired by the body at the end of 10 s?
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Answer:
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Explanation:
v = at
see the picture
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Answer: 4000J
Explanation:
Given
m=5kg
Initaially at rest means u=0 ms^-1
F=20N
t=10 sec
K.E=?
F=ma
20=5a
a=4ms^-2
a=Velocity/time
4=v/10
Velocity= 40ms^-1
KE= 1/2 mv^2
KE= 1/2× 5×40×40
KE=4000J
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