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Question

With what speed should a body be thrown upwards so that the distance traversed in 5th second and 6th second are equal? (Take g=9.8 m/s2)

A
5.84 m/s
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B
49 m/s
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C
98 m/s
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D
98 m/s
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Solution

The correct option is B 49 m/s
This could only be possible when the total time taken in upward journey will be 5 s.

Using the first equation of motion for the upward motion in the 5th second, we get

v=u+at
0=ug(5)
u=gt=9.8×5=49 m/s


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