Question

A car acquires a velocity of 72 kmph in 10 seconds starting from rest. Find (a) the acceleration, and (b) the average velocity.

Answer 1

Initial velocity, u = 0

Final velocity, v = 72 kmph = 20 m/s

Time, t = 10 s

Acceleration = change in velocity/time

= > a = (v - u)/t

= > a = 2 m/s²

Let s be the distance travelled in time t.

s = ut + ½ at²

= > s = 0 + ½ X 2 X 10²

= > s = 100 m

Average velocity = total distance/total time = 100/10 = 10 m/s