constant force

A block is pushed across a floor by a  that is applied at downward angle θ (Fig. 6-20). Figure 6-32 gives the acceleration magnitude a versus a range of values for the coefficient of kinetic friction μk be tween block and floor a1 = 3.0 m/s2, μk2 = 0.20, and μk3 = 0.40. What is the value of θ?

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Fig. 6-20

 

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Fig. 6-32

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