Question

A car is travelling at a speed of 30m/s . It develarates at a speed of 12m/s². Calculate the time taken by the car to come at rest​

Answer 1

Answer:

5/2 seconds

Step-by-step explanation:

use formula " V = U + at "

V (final velocity) is zero here, as we want car at rest

U = 30m/s

a = -12m/s²

(sign of minus here, because it's retardation)

V = U + at

0 m/s = 30 m/s + (-12m/s²) * t

solve now

Answer 2

Let Car takes x time to come to rest position.

• Initial velocity of car (u) = 30 m/s
• Final velocity (v) will be Zero.
• Deceleration (-a) = 12 m/s²

Using First Equation of Motion v = u + at to find the time taken by a car to come to rest.

→ v = u + at

→ 0 = 30 + (-12)t

→ 0 = 30-12t

→ 12t = 30

→ t = 30/12

→ t = 2.5

Hence,

A car takes 2.5 seconds to come to the rest Position.