First slide
Work done by Diff type of forces
Question

A block of mass m = 11. 7 kg is to be pushed a distance of s = 4.65 m along an incline and raised to a distance of h = 2.86 m. Assuming frictionless surface, calculate the work done in applying a force parallel to the incline to push the block up at a constant speed. (Take, g = 9.8 ms-2

Easy
Solution

Given,  m=11.7 kg,s=4.65 m,h=2.86 m

From the figure, sinθ=hs=2.864.65=0.615

Also, component of mg along the incline is mg sin θ.

Work done by this force = mg sin θ· s

= 11.7 x 9.8 x 0.615 x 4.65
= 11.7 x 9.8 x 2.86 = 327.9  328J

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