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A bocf ass 15 kg is placed on a long trolley. The coeflclent of static frictlonbetween the block and the trolley is 0.18. The trolley accelerates from rest with0.5 m sa for 20 s and then moves with unlform velocity. Discuss the motion of theblock as viewed by (a) a stationary observer on the ground. (b) an observer moving withthe trolley

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