A car accelerates at 2 meters per second per second.Assuming the car starts from rest,how much time does it need to accelerate to a speed of 30 m/s?
A)2 seconds
B)15 seconds
C)30 seconds
D)60 seconds
E)none of these

Question

Quizplus · Accepted Answer

We can use the equation: v = u + at
where
v = final velocity = 30 m/s
u = initial velocity = 0 m/s (since the car starts from rest)
a = acceleration = 2 m/s^2
t = time taken

Rearranging the equation, we get:
t = (v-u)/a
t = (30-0)/2
t = 15 seconds

Therefore, the car takes 15 seconds to accelerate to a speed of 30 m/s. The correct answer is B.

A Car Accelerates at 2 Meters Per Second Per Second