# The 10-lb block has a speed of 4 ft/s when the force of F = (8t2) lb is applied.

**QUESTION:**

The 10-lb block has a speed of 4 ft/s when the force of F = (8t^{2}) lb is applied. Determine the velocity of the block when it moves s = 30 ft. The coefficient of kinetic friction at the surface is _{s} = 0.2.

Probs. 13-6/7

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