A 20-kg block is originally at rest on a horizontal surface for which the coefficient of static friction is μs = 0.6 and the coefficient of kinetic friction is μk = 0.5. If a horizontal force F is applied such that it caries with time as shown, determine the speed of the block in 10 s. Hint: First determine the time needed to overcome friction and start the block moving.

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FIN) 200 I0