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Question

# A ball is thrown vertically upwards with a speed of 10 m/s from the top of a tower 200 m height and another is thrown vertically downwards with the same speed simultaneously. The time difference between them on reaching the ground is (g=10 m/s2)

A
12 s
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B
6 s
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C
2 s
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D
1 s
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Solution

## The correct option is D 2 s1st ball will return to initial pt. with a velocity which is same in magnitude and reverse in direction, hence from A to C the time is same.So, difference is when ball from A goes to Band comes back to A.Hence, this time, t=2ug=2×1010=2 sec

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