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There are 3 contestants A, B and C in a 100 km car race. The following graph gives the time which each of them took to cover different phases of the race. Select from among the following the relevant formula, where ever necessary.
• x-xi = (v+vi)t /2
• v-vi= at
• x-xi = vi t + at2 /2
• v2 – vi2= 2a(x- xi)
Were xi is the initial distance x is the new distance. vi is the initial velocity and v is the new velocity and t is the time.
Assuming that all of the three moved with uniform speed in the phases of distance given below, which alternative correctly represents them in ascending order?
[p]-Speed of A in between 20 and 40km.
[q]-Speed of B in between 40 and 70 km.
[r] -Speed of C in between 70 and 90 km.

### Options :-

1. [p], [q], [r]

2. [q], [p], [r]

3. [r], [p], [q]

4. [p], [r], [q]

5. none of the above

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