A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration.

Physics Jamb, Waec, Neco Past Questions & Answers on Speed, Velocity and Acceleration

QUESTIONS 11. A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration. 

WAEC 2002 Ans: 1.6m/s2

Solutions

Initial velocity u = 0m/s

Distance s = 80m 

Time t = 10 sec

Acceleration a = ?

Applying the second equation of motion

S = ut + ½at²

80 = 0 x 10  + ½ (a) (10)²

80 = 0 + ½ X 100 X a

80 = 100a/2

Cross multiplying

80 x 2 = 100a

a = 160/100

a = 16/10

a = 8/5

a = 1.6m/s² Answer