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!

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current