Question

A car starting from rest acquires a velocity of 54 kmh in 20 s.
Calculate the acceleration of the car in S.I. unit.​

Answer 1

Answer:

ok here u=0 , v=15m/s(after conversion) t=20s

so according to 1st equation of motion

v=u+at

acceleration = 3/4ms-2

Answer 2

The acceleration of the car is $a=0.75\ m/s^2$.

Explanation:

Given that,

Initial speed of the car, u = 0 (at rest)

Final speed of the car, v = 54 km/h = 15 m/s

Time, t = 20 s

We need to find the acceleration of the car. The acceleration of an object is given by the change in velocity per unit time. It is given by :

$a=\dfrac{v-u}{t}$

$a=\dfrac{15\ m/s}{20\ s}$

$a=0.75\ m/s^2$

So, the acceleration of the car is $a=0.75\ m/s^2$. Hence, this is the required solution.

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