Question

A car start from rest and after 20 sec it's velocity becomes 108kmh–¹ find the acceleration of car

Answer 1

The answer is 1.5 m/S2.

Answer 2

Given:-

→ Initial velocity of the car = 0

[as it starts from rest]

→ Final velocity of the car = 108km/h

→ Time taken = 20sec

To find:-

→ Acceleration of the car

Solution:-

Firstly, let's convert the final velocity of the car from km/h to m/s.

=> 1km/h = 5/18m/s

=> 108km/h = 108×5/18

=> 30m/s

Now, let's calculate the acceleration of the car by using the 1st equation of motion :-

=> v = u + at

Where:-

• v is final velocity of the body.

• u is initial velocity of the body.

• a is acceleration of the body.

• t is time taken.

=> 30 = 0 + a(20)

=> 30-0 = 20a

=> 30 = 20a

=> a = 30/20

=> a = 1.5m/s²

Thus, acceleration of the car is 1.5m/s² .