Question

At the start of a race, a runner’s velocity changes from 0 to 4,0 m/s. It takes him 2 seconds to speed up. His

acceleration is ___ m/s2.

Please answer with a explanation if you can.

Answer 1

At the start of a race, a runner’s velocity changes from 0 to 4.0 m/s. It takes him 2 seconds to speed up. His acceleration is 2 m/s2.

Step-by-step explanation:

Acceleration is the rate at which velocity changes. To find the acceleration, divide the change in velocity (final velocity − initial velocity) by the time interval. In this example, the change in velocity is 4.0 m/s in 2 seconds. So, divide 4.0 by 2.

I hope this explanation helps you understand accelerations!

Answer 2

2 m/s²

Step-by-step explanation:

Given:

v₀ = 0 m/s

v = 4.0 m/s

t = 2 s

Find: a

a = (v − v₀) / t

a = (4.0 m/s − 0 m/s) / 2 s

a = 2 m/s²