Question

A cyclist speed up at a constant rate from rest to $8m/s$ in $6s$. Find the acceleration of the cyclist.

• A. $\frac{2}{3}m/s^2$
• B. $\frac{1}{3}m/s^2$
• C. $\frac{4}{3}m/s^2$
• D. $\frac{3}{4}m/s^2$

Answer 1

The correct option is C $\frac{4}{3}m/s^2$

Given:
Body start from rest, or initial velocity:
$u=0m/s$
Final Velocity, $v=8m/s$
Time taken, $t=6s$

From definition of acceleration,
$a=\frac{v-u}{t}$
$a=\frac{8-0}{6}$
$a=\frac{4}{3}m/s^2$