The distance-time graph of the motion of a toy car is shown in the figure. Which of the following statements is false for the toy car?

Options

A. Car is moving fastest during the time interval 5 s to 10 s.
B. Average speed of the car is 0.8 m/s.
C. Car is moving with three different speeds during whole journey.
D. Speed of the car at 8s is 0.8 m/s.

Answer

D

Explanation

Rate of change of distance is greatest during the erval 5 s to 10 s. So the car moves fastest during this time interval.
For 5 s to 10 s : `v = (12- 4)/(10-5) = 1.6 m//s`
Average speed, `v = ("Total distance travelled")/("Total time taken")`
`rArr v = (20-0)/(25) = 0.8 m//s`