Time taken by a block of wood (initially at rest) to slide down a smooth inclined plane 9.8, m long

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4-1.Newton's Laws of Motion

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The time taken by a block of wood (initially at rest) to slide down a smooth inclined plane $9.8\, m$ long (angle of inclination is ${30^o}$) is.........$sec$

A$0.5$

B$2$

C$4$

D$1$

Solution

(b) For one dimensional motion along a plane
$S = ut + \frac{1}{2}a{t^2}$$ \Rightarrow 9.8 = O + \frac{1}{2}$ $g\sin {30^o}{t^2}$
$⇒$ $t = 2\sec $

Standard 11

Physics

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