Can A car traveling on an interstate highway have a negative velocity and a posi

Question

Can A car traveling on an interstate highway have a negative velocity and a positive acceleration at the same time? Explain.
Can the cars velocity changes signs while it is traveling with constant qcceleration? Explain Can A car traveling on an interstate highway have a negative velocity and a positive acceleration at the same time? Explain.
Can the cars velocity changes signs while it is traveling with constant qcceleration? Explain
Can the cars velocity changes signs while it is traveling with constant qcceleration? Explain

Explanation / Answer

Hi, The answers are given below.

1. Yes. If we are considering the direction opposite to the velocity vector as positive, we can have a negative velocity. Also if the can is braking for reducing its speed, according to our reference we can say that the acceleration vector is positive.

2. Yes. Consider a case like this. The car is moving backward freely, due to some external force applied initially. Now the driver applies constant acceleration by pressing the accelerator, the speed with which the car moving backwards will start decreasing. After some time, speed will become zero and car comes to rest for a moment. Suddenly the car starts moving forward with constant acceleration. i.e., the velocity is now positive and increasing.

Regards

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