A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is A) 10 m/s². B) 2.5 m/s². C) 0 m/s². D) -2.5 m/s². E) -10 m/s².

Question

Quizplus · Accepted Answer

Since the car comes to rest, its final velocity is 0 m/s. The initial velocity is 20 m/s. Using the formula v = u + at, we can solve for the average acceleration on the hill: a = (v - u) / t = (0 - 20) / 8 = -2.5 m/s^2. Therefore, the answer is choice D.

A Car Is Traveling at the Velocity of 20 M/s