Question: A 30-tb block is initially moving along a smooth horizontal surface with a speed of v1 = 6 ft/s to the left. If it is

A 30-tb block is initially moving along a smooth horizontal surface with a speed of v1 = 6 ft/s to the left. If it is acted upon by a force F, which varies in the manner shown, determine the velocity of the block in 15 s.

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