How long does it take to accelerate an object from rest to 15 m/s if the acceleration was 3 m/s2?
A: 2 s
O B:4 s
C: 5 s
O D:15 s

C

Explanation:

Givens

a = 3 m/s^2

vi = 0

vf = 15 m/s

t = ?

Equation

a = (vf - vi)/t

Solution

3 = (15 - 0)/t    Multiply both sides by t

3t = 15            Divide by 3

t = 15/3

t = 5  

t= 5 seconds.

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explanation: