A girl running a race accelerates at 2.5, m s ^{-2} for first 4, s of race. How far does she travel

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7. MOTION

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A girl running a race accelerates at $2.5\, m s ^{-2}$ for the first $4\, s$ of the race. How far does she travel in this time ?

Option A

Option B

Option C

Option D

Solution

Given $u=0, a=2.5 m s ^{-2}, t=4 s$ and $S =?$

Substituting the values in equation

$S=u t+\frac{1}{2} a t^{2},$ we have

$S=0 \times 4+\frac{1}{2} \times 2.5 \times 4^{2}=20 m$

Standard 9

Science

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