What speed does the car acquire when braking with an acceleration of 1 m / s2 15 s

What speed does the car acquire when braking with an acceleration of 1 m / s2 15 s after the start of braking, if its initial speed was 45 km / h?

Let’s translate the speed, which is presented in the condition of the task, from km / h to m / s:

45 * 1000: 3600 = 12.5.

As we know from the school curriculum in physics, the speed with uniform deceleration of the body can be calculated using the following formula:

vfin = vstart – at.

Let us determine what value the acquired speed will equal if from the condition of our problem we know for sure that the car braked for 15 seconds with an acceleration of 1 m / s2:

12.5 – 15 * 1 = -2.5.

This means that the car has already braked by this moment.

Answer: 0.