Question

A car is traveling east at a speed of 25 m/s. It then takes

5 seconds to a stop at a red light (final velocity=0 m/s).
What is the acceleration of the car?

Answer 1

-5m/s²

Step-by-step explanation:

Given parameters:

Initial velocity = 25m/s

Time = 5s

Final velocity = 0m/s

Unknown:

Acceleration of the car = ?

Solution

The acceleration of a body is the rate of change of the velocity of the body with time.

Acceleration =
`(Final velocity - Initial velocity )/(time)`

So;

Acceleration =
`(0 - 25)/(5)` = -5m/s²

The car is decelerating at a rate of 5m/s²