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Question

A particle of mass $5 k g$ is moving on rough fixed inclinde plane with constant velocity of $5 m / s$ as shown in figure. Find the friction acting on a body by plane.

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Solution

The body is moving down with constant velocity, so the downward force is equal to frictional force.
$f = m g sin θ$
$= 5 \times 9.8 \times sin 30^{\circ}$

$= 24.5 N$

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