Question

Following table gives the displacement of a car at different instants of time. (a) Draw the displacement-time sketch and find the average velocity of car. (b) What will be the displacement of car at (i) 2.5 s and (ii) 4.5 s ?

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Answer

Time (s) 0 1 2 3 4
Displacement (m) 0 5 10 15 20

 

(a) The displacement-time sketch for the car is shown below:

displacement-time-graph-car

As we know,

Avg. velocity of car = Total\ distance \over Total\ Time

= 20 - 0 \over 4 - 0

= 20 \over 4

= 5 ms-1

Hence, the average velocity of the car is 5 ms-1.

(b) When we observe the graph, we can find the displacement of the car at various points,

At t = 2.5 s, displacement = 12.5 m and

At t = 4.5 s, displacement = 22.5 m

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