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7. MOTION
hard
$(a)$ A car moving with uniform velocity $'u^{\prime}$ and uniform acceleration $'a^{\prime}$ covers a distance $'S^{\prime}$ in time $'t^{\prime}$. Draw its velocity $-$ time graph and derive an expression relating all the given physical quantities.
$(b)$ A boy revolves a stone tied to a string $0.7 \,m$ long. Find the distance and displacement covered by the stone in completing two revolutions from starting point.
Option A
Option B
Option C
Option D
Solution
$(a)$ See long answer type questions.
$(b)$ Given $r=0.7 m ,$ Distance $=?$, Displacement $=?$
Distance $=2 \times 2 \pi r=2 \times 2 \times 3.14 \times 0.7$
$=8.792 m$
Displacement $=0$
Standard 9
Science
