A 5 kg box is pulled upward along a smooth 30° incline by a rope with tension 30 N. Find its acceleration, taking g=10 m s⁻².
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Question

A 5 kg box is pulled upward along a smooth 30° incline by a rope with tension 30 N. Find its acceleration, taking g=10 m s⁻².

G1 Physics · Accepted Answer

Component of weight down incline mg sin30°=5×10×½=25 N. Net force uphill =30−25=5 N. Hence a=5/5=1 m s⁻² up incline. Answer: D.