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Q.

A block of mass 5kg starting from rest pulled up on a smooth incline plane making an angle of 30° with horizontal with an affective acceleration of 1 ms-2. The power delivered by the pulling force at t = 10s from the start is _____W [use g = 10 ms-2]  (calculate the nearest integer value)

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answer is 300.

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Detailed Solution

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Force required to pull up with an acceleration 1 m/s2 is 
 F=mgsinθ+ma=30N
Velocity at t = 10 sec is 10 m/s
 ∴P=Fv=30×10=300 watt

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