Question

A car driver traveling at a speed of 108km per hour ,sees a traffic light and stopped after travelling for 20seconds .Find the acceleration of the car​

Answer 1

– 2.5 m/s²

Step-by-step explanation:

We have,

• Initial velocity, u = 180 km/h = 50 m/s

• Final velocity, v = 0 m/s (it stops)

• Time taken, t = 20 seconds

We have to find acceleration, a.

`\longrightarrow` a = (v ― u)/t

`\longrightarrow` a = (0 – 50)/20 m/s²

`\longrightarrow` a = –50/20 m/s²

`\longrightarrow` a = – 5/2 m/s²

`\longrightarrow` a = – 2.5 m/s² (Velocity is decreasing) [Answer]