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Q. The plank rests on the floor at A and on smooth fixed block at C. If the coefficient of friction between the plank and the floor at A is .3, determine the range of heights H of the block for which the plank won't slip on the floor.

Q. A stone thrown upward from the top of a 100ft cliff at 150ft/s eventually falls to the beach below. (For this problem take the acceleration because of gravity to be -32 ft/s^2; take upwards to be a positive direction.) How long does it take the stone to reach its highest point?

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