`4` identical balls of radius `R` and mass `m` are lying a gravity free space. The balls are in contact and there centres are forming vertices of a square of side `2R` in horizontal plane. One identical ball travelling vertically with a speed `v` hits the four balls symmetrically. The collision is perfectly elastic. The centre of the `4` stationery ball are at (`R`, `R`, `0`), (`R`, `-R`, `0`) and (`-R`, `-R`,`0`) initially. The speed of ball which was intitially travelling with speed `v` just after collision is A. `(v)/(3)`B. `(21v)/(11)`C. `v`D. `2v`

`4` identical balls of radius `R` and mass `m` are lying a gravity fre

1.	`4` identical balls of radius `R` and mass `m` are lying a gravity free space. The balls are in contact and there centres are forming vertices of a square of side `2R` in horizontal plane. One identical ball travelling vertically with a speed `v` hits the four balls symmetrically. The collision is perfectly elastic. The centre of the `4` stationery ball are at (`R`, `R`, `0`), (`R`, `-R`, `0`) and (`-R`, `-R`,`0`) initially. The speed of ball which was intitially travelling with speed `v` just after collision is A. `(v)/(3)`B. `(21v)/(11)`C. `v`D. `2v`
Answer» `V-(4v)/(3)=V_(2)` `V_(2)=-V//3`

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