Question: The 40-lb block is moving downward with a speed of 3 ft/s at t = 0 when constant forces P and 2P are applied through

The 40-lb block is moving downward with a speed of 3 ft/s at t = 0 when constant forces P and 2P are applied through the ropes. Knowing that the block is moving upward with a speed of 2 ft/s when t = 4 s, determine

(a) The magnitude of P,

(b) The time at which the speed is zero. Neglect the effect of friction and the masses of the pulleys.

40 lb 2P

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