a car starting from rest and gains speed up to 36 m per hour within 5 second find the acceleration of the car if the same car stops in 20 second find the retardation

Answers 1

Answer:

Acceleration = 2m/s²

Retardation = -0.5m/s²

Given:

Initial velocity = 0m/s

Final velocity = 36m/hr or 10m/s

Time = 5 s

Explanation:

The formula to find acceleration is given by

v = u + at

where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.

Solution: v = u + a×t

10 = 0 + a×5

10 = a × 5

a = 2m/s²

Now,

Final velocity = 0m/s

Initial velocity = 10m/s

The time in which it stops = 20 s

Applying the same formula,

v = u + a×t

0 = 10 + a × 20

a = - [tex]\frac{10}{20}[/tex]

a = -0.5m/s² (Retardation)