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A 5 kilogram mass is lifted at constant velocity from a shop floor by a rope that passes by a pulley attached to the shop's ceiling.
Neglecting the mass of the rope and friction in the pulley, what is the approximate tension in the rope?
a) 100 newtons
b) 50 newtons
c) 25 newtons
d) 5 newtons
Ans- 50 Newton
Because force=dp/dt and force=0 in first law of motion => dp/dt=0 => p=const. or linear momentum is conserved.
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