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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

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

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