Question

calculate the acceleration of an object starts from rest and attains a velocity of 72 km per hour in 20 seconds

Answer 1

given
u= 0m/s
v= 72 km/h or 72×5/18= 20m/s
t = 20 s
as
a= v - u / t
= 20 - 0 / 20
= 20/20
=1m/ s^2