Question

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

Answer 1

Answer:

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  

Answer: t= 5 seconds.