Question

an athelete takes 2.0s to reach his maximum speed of 18.0 km/h. what is the magnitude of his average acceleration

Answer 1

Sol. Initial velocity u = 0 (∴ starts from rest) Final velocity v = 18 km/hr = 5 sec (i.e. max velocity) Time interval t = 2 sec. ∴ Acceleration = aave = (v-u )/t = 5/2 = 2.5 m/s2.

Answer 2

2.5m/s2 is the answer................