First slide

Connected bodies

Question

In shown figure m₁ = 2kg and m₂ - 4 kg. The pulley is movable. At t = 0, both masses touch the ground and the string is taut. A vertically upward force F = 2t (F is in newton and t is in second) is applied to the pulley"
the time when m₂ is lifted off the ground is:

Moderate

A

10 s
B

20 s
C

30 s
D

40 s

Solution

$m_{2} is lifted off if \frac{F}{2} \geq m_{2} g \Rightarrow t \geq 40 s$

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