Question

An athlete takes $2s$ to reach his maximum speed of $18km/hr$ after starting from rest. What is the magnitude of his average acceleration?

Answer 1

Initial speed =$0$

Final speed = $18Km/hr$

=$\frac{18\times 1000}{3600}=5m/sec$

$v=u+at$

$5=0+a\times 2$

$\therefore a=\frac{5}{2}=2.5m/s^2$