Question

An electric vehicle starts from rest and accelerates at a rate of 2.3 m/s2 in a straight line until it reaches a speed of 29 m/s. The vehicle then slows at a constant rate of 1.5 m/s2 until it stops. (a) How much time elapses from start to stop

Answer 1

t = 12.6 seconds

Step-by-step explanation:

Given that,

Initial velocity, u = 0

Acceleration of an electric vehicle, a = 2.3 m/s²

Final velocity, v = 29 m/s

We need to find the time elapses from start to stop. The acceleration of an object is given by the relation as follows :

`a=(v-u)/(t)\\\\t=(v-u)/(a)\\\\t=(29-0)/(2.3)\\\\t=12.6\ s`

So, 12.6 seconds is elapsed from start to stop.