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Two identiacal masses are as shown in fi...

Two identiacal masses are as shown in figure. One is thrown upwards with velocity 20 m/s and another is just dropped simultaneously.
The masses collide I air and stick together. After how much time the combined mass will fall to the gorund (calculate the time from the starting when the motion was started )

A

`(1+sqrt2)s`

B

`2sqrt2s`

C

`(2+sqrt2)s`

D

None of the above

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