Question

A car travelling at 14.0 m/s approaches a traffic light. The driver applies the brakes and is able to come to halt in 5.6 s. Determine the average acceleration of the car during this time interval.

Answer 1

`a=2.5\ m/s^2`

Step-by-step explanation:

Given that,

Initial speed of the car, u = 14 m/s

Finally, it comes to rest, v = 0

Time, t = 5.6 s

We need to find the average acceleration of the car during this time interval. We know that,

`a=(v-u)/(t)\\\\a=(0-14)/(5.6)\\\\a=-2.5\ m/s^2`

So, the acceleration of the car is
`2.5\ m/s^2` in the opposite direction of motion.