When a forceP is applied to the cable at time t = 0, the loaded 160-kg skip is rolling down the incline at 4.5 m/s. The force P is uniformly increased with time until it reaches 620 N at t= 4s, after which it remains constant at this value. Determine the magnitude of the velocity (m/s) of the skip when t = 3.5s. 30
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