A girl running in a race accelerates at $2.5 m / s^{2}$ for the $4 s e c o n d s$ of the race. How far does she travel in this time?

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Solution

Step 1 : Given data
Acceleration of the girl, $a = 2.5 m / s^{2}$
Time of Acceleration , $t = 4 s e c o n d s .$
Initial velocity , $u = 0 m / s .$
Step 2: using second equation of motion
Distance covered, $s = u \times t + \frac{1}{2} \times a \times t^{2}$
Step 3: calculating the distance travelled by her.
$s = 0 \times 4 + \frac{1}{2} \times 2.5 \times 4^{2}$
$s = 2.5 \times 8 = 20 m e t r e$
Hence, the girl travels $20 m e t r e$ in this time.

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A girl running in a race accelerates at 2.5m/s2 for the 4seconds of the race. How far does she travel in this time?

A girl running in a race accelerates at $2.5 m / s^{2}$ for the $4 s e c o n d s$ of the race. How far does she travel in this time?