Asprinter accelerates from the starting block to a speed of 8.0 m/s in 4.0 s. what is the magnitude of the sprinter’s acceleration?

a. 12.0 m/s

b. 2.0 m/s2

c. 2.0 m/s

d. 12.0 m/s2

The correct answer is B.

Explanation:

First, we must identify the data of the problem:

: Initial speed.

V: Final speed.

a: Acceleration.

t: Time.

Using the cinematic formula:

V = + a * t

We cleared the incognita a:

a =

Since the sprinter starts from rest, we consider = 0 .

So when we replace the data in the equation we are left:

a =

a= 2

Have a nice day!

it can be icreased by increasing pressure.