Question

A Car Accelerates at 2 m/s^2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?

A. 15 seconds
B. 2 seconds
C. 30 seconds
D. 60 seconds​

Answer 1

Answer: 15 seconds (choice A)

Work Shown:

• vi = initial velocity = 0 m/s
• vf = final velocity = 30 m/s
• a = acceleration = 2 m/s per second

t = elapsed time in seconds

t = (vf - vi)/a

t = (30 - 0)/2

t = 30/2

t = 15 seconds