Question

a car starts from rest and picks up a speed of 54km/h in 10 seconds .calculate the acceleration of the car in m/s​

Answer 1

Answer:

Acceleration = Final Velocity - Initial Velocity / Time

Final Velocity = 54 km/h

Initial Velocity = 0 km/h ( because the car was in rest)

Time = 10 seconds

Acceleration = 54-0/10 = 54/10 = 5.4 km / m^2 or 5.4 × 5/18 = 1.5 ms^2

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Answer 2

Answer:

1.5 m / sec²

Explanation:

Given :

Initial velocity u = 0 m / sec

Final velocity v = 54 km / hr

In term of m / sec :

= > v = 54 × 5 / 18 m / sec = 15 m / sec

Time t = 10 sec

We are asked to find acceleration :

Using first equation of motion :

v = u + a t

= > a = ( v - u ) / t

Putting values here we get :

= > a = ( 15 - 0 ) / 10 m / sec²

= > a = 15 / 10 m / sec²

= > a = 1.5 m / sec²

Hence we get required answer.