Q.

A ball is thrown vertically upwards with a speed of 10 m/s and vertically downwards with the same speed simultaneously. The time difference between them in reaching the ground )(in s) is:g=10m/s2

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a

12

b

6

c

2

d

1

answer is C.

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Detailed Solution

They have same displacement h=-ut1+12gt12 and h=ut2+12gt 22 equating and solving u=12gt1-t2
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A ball is thrown vertically upwards with a speed of 10 m/s and vertically downwards with the same speed simultaneously. The time difference between them in reaching the ground )(in s) is:g=10m/s2