Question #050a0

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Question #050a0

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Answer 1 · 2016-12-04T10:56:26

Let the height of the inclined plane be $h$ $h$ and length of the inclined plane be $l$ $l$ .

If $m$ $m$ represents mass of the block and $g$ $g$ represents acceleration due to gravity, then weight of the body will be $w = m g$ $w=mg$

The work done in raising the block to the top of the plane by applying force $m g$ $mg$ along the plane is given by $m g l$ $mgl$ (assuming the plane is frictionless).When the block reaches at the top it will have both KE and PE.

As the block reaches at height h it will gain gravitational PE $= m g h$ $=mgh$

Hence

$m g h + K E = m g l$ $mgh+KE=mgl$

$\Rightarrow K E = m g (l - h)$ $=>KE=mg(l-h)$

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Question #050a0

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