Question

a sprinter increases the speed from 0 meters per second to 9 meters per second in 2 seconds. what is the acceleration

Answer 1

The acceleration is

`4.5 {ms}^( - 2)`

Explanation:

Use the equation of motion,

`v = u + at`

where u=0m/s is the initial speed, v=9m/s is the final speed and t=2 seconds is the time.

We substitute the values into the equation and solve for the acceleration, a

`9 = 0 + a(2)`

This means that;

`9 = 2a`

Divide both sides by 2 to get:

`a = (9)/(2)`

`a = 4.5 {ms}^( - 2)`