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Question
A bus moving along a straight line at 20 m/s undergoes an acceleration of 4 m/s2. After 2 seconds, its speed will be:
Options
8 m/s
12 m/s
16 m/s
28 m/s
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Solution
28 m/s
Acceleration of the moving object is 4 m/s2
Initial velocity is 20 m/s.
Time taken is 2 sec.
By applying 1st equation of motion we get,
v = u + at
= 20 + 2(4)
= 28 m/s
So, the answer is
(d) 28 m/s
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