The diagram below (Fig. 1.18) shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are

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

QUESTIONS 38. The diagram below (Fig. 1.18) shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are. 

A. 8.0 ms'2, 4.0 ms'2 

B. 4.0 ms'2, 8.0 ms'2 

C. 4.0 ms'2, 2.0 ms'2 

D. 2.0 ms'2, 4.0 ms'2 

JAMB 1999 Ans: 4ms'2, 2ms'2 

SOLUTIONS 

Calculating for its acceleration a

Acceleration a = Change in velocity/time taken 

a = 80-0/20-0

a = 80/20

a = 8/2

a => 4m/s²

Calculating for deceleration d = acceleration a

Acceleration a = Change in velocity/time taken 

a = 80-0/90-50

a = 80/40

a = 8/4

a = 2/1

a = 2m/s²