Question

Felipe drives his car at a velocity of 28 m/s. He applies the break, which slows the vehicle down at a rate of 6.4 m/s ^2 and causes it to slow to a stop. How long does it take for the car to stop?

Answer 1

If the acceleration applied is constant, then it is the same as the average acceleration throughout the duration of the stop.

`a=(\Delta v)/(\Delta t)\implies-6.4\,(\mathrm m)/(\mathrm s^2)=(0-28\,(\mathrm m)/(\mathrm s))/(\Delta t)\implies\Delta t=4.4\,\mathrm s`