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Question

What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?

A
2 ms2
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B
0.8 ms2
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C
7.5 ms2
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D
4 ms2
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Solution

The correct option is B 0.8 ms2
Given:
Initial velocity, u=0 ms1
Final velocity, v=20 ms1
Time, t=25 s

From the first equation of motion,
v=u+at
20=0+a×25
a=2025=0.8 ms2

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