The mass of a body is 40 kg. If it moves at a speed of 15 m/s, what is its
kinetic energy?
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Answer:
Mass=40kg,v=1m/s,v=2m/s
According to the work-energy conversion theorem;
Work done by the force= Change in Kinetic energy,
Work done by the force =(
2
1
)×m×(v
2
−u
2
)
Work done =0.5×40×(4−1)=60J
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