Question

An athlete is accelerating uniformly from an initial velocity of 0 m.s-1 to a final velocity of 4 ms-1 in 2 seconds. Calculate his acceleration let the direction athlete is running in be the positive direction.​

Answer 1

2 m/s² = 2 m.s^-2

Explanation:

how to get acceleration in such a case :

find the change in velocity for the given time.

find the change in time for the considered period.

divide the change in velocity by the change in time.

this is the average acceleration for that period of time.

after all,

acceleration = speed/time = distance/time/time =

= distance/time²

so, we have a change of velocity from 0 to 4 m/s = 4 m/s.

and we have a change of time of 2 seconds.

that gives us the acceleration

4 m/s / 2s = 4 m / 2s² = 2 m/s²