19. A block of mass m at rest is acted upon by a force F for a time t. The kinetic energy of block after time t is
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Answer:
2m
F
2
t
2
Explanation:
Uniform force F acts during t seconds,
the change in momentum is =F× t.
Initial momentum = 0
final momentum P = Ft
Kinetic energy =
2m
P
2
=
2m
F
2
t
2
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