Question

A human runner has an average acceleration of 1.2 m/s/s. They ran for a total of 21 seconds. What is their change in velocity?

Answer 1

Answer: 25.2m/s

Explanation:

as a = vf - vi /t

vf-vi=t*a

vf-vi= 1.2*21

vf-vi= 25.2m/s

Answer 2

Answer:

The change in velocity is 25.2m/s.

Explanation:

Given acceleration is $1.2m/s^{2}$,

given time is $21 sec$

What is velocity?

The displacement travelled in one second is called velocity, denoted by (v).

What is acceleration?

The rate of change of velocity is called an acceleration, denoted by (a).

Formula used:  a=Δv/Δt,

putting values: 1.2=Δv/21,

so change in velocity Δv=25.2m/s.

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