A body initially at rest is accelerated at a constant rate for 5.0 seconds in the positive x direction. If the final speed of the body is 20.0 m/s, what was the body's acceleration? A)0.25 m/s² B)2.0 m/s² C)4.0 m/s² D)9.8 m/s² E)1.6 m/s²

Question

Quizplus · Accepted Answer

We can use the kinematic equation:
vf = vi + at
where vf is the final velocity (20.0 m/s), vi is the initial velocity (0 m/s), a is the acceleration (unknown), and t is the time (5.0 s).

Solving for a, we get:
a = (vf - vi)/t
a = (20.0 m/s - 0 m/s)/5.0 s
a = 4.0 m/s^2

Therefore, the body's acceleration was 4.0 m/s^2.

A Body Initially at Rest Is Accelerated at a Constant