Question

A car traveling at 40 m/s starts to decelerate steadily. It comes to a complete stop in 5 seconds. What is its acceleration? m/s2

Answer 1

Acceleration =

(change of speed) / (time for the change).

Change of speed = (speed at the end) - (speed at the beginning)

= ( zero ) - (40 m/s)

= -40 m/s .

Acceleration = (-40 m/s) / (5 seconds)

= -8 m/s² .