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A ball is thrown upwards from the ground...

A ball is thrown upwards from the ground . It is at a height of 100m in upwards and downward journeys at times `t_1` and `t_2` respectively , If g = `10m/s^2` , then `t_1t_2` is equal to

A

10

B

20

C

40

D

50

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The correct Answer is:
B
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