Question

A car traveling at 15 m/s starts to decelerate steadily. It comes to a complete stop in 5 seconds. What is its acceleration ?

Answer 1

`-3m {s}^(-2)`

Step-by-step explanation:

The initial velocity, u, of the car=15m/s

The final velocity, v, of the car =0m/s

Time, t, taken for the car to come to a stop=5s

Acceleration is calculated by,

`a= (v - u)/(t)`

By substitution,

`a= (0- 15)/(5)`

`a= (- 15)/(5)`

`a = -3 {ms}^( - 2)`

The negative sign implies that the car has decelerated.