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Question

A car accelerates uniformly from 20 ms1 to 50 ms1 while entering the motorway, covering a distance of 200 m. Then the acceleration of the car will be:

A
4.25 ms2
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B
6.30 ms2
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C
5.25 ms2
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D
5.65 ms2
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Solution

The correct option is C 5.25 ms2
Given,
s=200 m
u=20 ms1
v=50 ms1
a=?
Using 3rd equation of motion i.e.
v2=u2+2as
(50)2=(20)2+(2×a×200)
2500=400+400a
400a=2500400=2100
a=2100400=5.25 ms2

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