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Newton's Second Law

A block of ma...

Question

A block of mass $2 k g$ is released from point $A$ on the smooth inclined plane as shown in the fig. Work done by the gravitational force on the block during the journey of point $A$ to $B$ is $(T a k e g = 10 m / s^{2})$

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Solution

From figure, $tan 37^{o} = \frac{h}{4}$
Or $\frac{3}{4} = \frac{h}{4}$ $⟹ h = 3 m$
Work done by gravity $W_{g} = m g (h) = 2 \times 10 \times 3 = 60 J$

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