A car starts from rest and accelerates at a constant rate in a straight line. In the first second the car moves a distance of 2.0 meters. How fast will the car be moving at the end of the second second?
A)4.0 m/s
B)16 m/s
C)2.0 m/s
D)32 m/s
E)8.0 m/s

Question

Quizplus · Accepted Answer

The car moves 2.0 meters in the first second, which means the average velocity during the first second is 2.0 m/s. Since it starts from rest, the final velocity at the end of the first second is 4.0 m/s (twice the average velocity). With constant acceleration, the velocity increases linearly, so at the end of the second second, the velocity will be 8.0 m/s.

A Car Starts from Rest and Accelerates at a Constant