Chapter 6, Problem 34A

The auto in the sketch moves forward as the brakes are applied. A bystander says that during the interval of braking, the auto’s velocity and acceleration are in opposite directions. Do you agree or disagree?

To determine

To explain: Whether a person agree or disagree with the fact that auto’s velocity and acceleration are in opposite direction.

Explanation of Solution

Introduction:

Acceleration is rate of change of velocity. Negative acceleration is called retardation.

Velocity is rate of change of displacement with respect to time. When breaks are applied auto velocity goes on decreasing that is acceleration of auto is negative. Auto is decelerating. So autos velocity and acceleration are in opposite direction.

Conclusion:

Therefore, a person will agree that auto’s velocity and acceleration are in opposite direction.