If the velocity of a car changes from 20 meters per second (m/s) to 60 m/s in 4 seconds, what is the acceleration over that 4 second period?
m/s2

10 m/s^2

Explanation:

Let,

u-> initial velocity = 20m/s

v-> final velocity = 60m/s

t-> time = 4s

a-> acceleration

u = 20m/s

v = 60m/s

t = 4s

Using Velocity - Time relation,

v = u + at

=> v - u = at

=> (v - u)/t = a

=> a = (v-u)/t

=> a = (60-20)/4

=> a = 40/4

=> a = 10 m/s^2