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Question

A ball is shot vertically upward from the ground. It loses 23rd of initial speed after rising up for 4 seconds, then total time of upward journey will be

A
5 s
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B
6 s
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C
7 s
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D
9 s
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Solution

The correct option is B 6 s
Let initial speed be V0
After 4 seconds, speed must be V03

Using, v=u+at
V03=V010(4)
40=2V03
V0=40×32=60 m/s

Again using, v=ugt, but now v=0, u=V0
t=V0g=6010=6 s
Hence total time for upward journey is 6 s.

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