Question

A car starting from rest and moving with uniform acceleration attains a speed of 90km/h in 20s. calculate uniform acceleration

Answer 1

(u)initial velocity=0m/s
(v)final velocity=90×1000/60×60
=25m/s
(t)time=20s
acceleration=v-u/t
=25-0/20
=5/4
=1.25m/s

Answer 2

Answer: The correct answer is 1.25 meters per second

Explanations: The rate of change in the velocity of any object is called acceleration and acceleration is a vector quantity uniform means doesn't thing which doesn't change over time and remains constant concerning other quantities which keep changing so uniform acceleration means any object which is traveling in a straight line because it is not changing and with the increased velocity that means velocity is changing at equal intervals of time. for example, any object which freely falls is uniform acceleration like when you throw a ball in the air and it comes down, in that case, the velocity is increasing in equal intervals f time but acceleration remains the same.

Given -

speed of the car = 90 km per hour

Solution -

(u)initial velocity=0m/s

(v)final velocity = 90×1000 / 60×60

                            =25m/s

(t)time = 20s

acceleration =  v - u / t

                      =25-0/20

                      =5/4

                      =1.25 m / s