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Question

The kinetic energy acquired by a mass m travelling distance d, starting from rest, under the action of a constant force is directly proportional to:
  1. m
  2. m0
  3. m
  4. 1/m

A
m0
B
m
C
m
D
1/m
Solution
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Work done by external forces = Change in kinetic energy
Since particle starts from rest, its initial Kinetic Energy is 0.
Therefore, K.E.=Fd
It is given that force is constant.
We see that Kinetic energy is independent of mass.
Correct option is (B)

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