Velocity-time graph

Diagram below shows a velocity-time graph for the motion of a toy car.
Rajah di bawah menunjukkan graf halaju-masa bagi sebuah kereta mainan.










What is the displacement of the car in 9 seconds?
Berapakah sesaran kereta itu dalam masa 9 saat?



A            0 m
B          10 m
C          60 m
D          80 m






Luas graf= (1/2)(20)(7)(ms-1)(s) - (1/2) (10)(2) (ms-1)(s)
= 60 m



Answer : C