Q 1488191007.     A ball is projected normally from point `P` (which is on an inclined plane) with speed `sqrt(50)` `m//s`. It strikes the vertical wall normally. If all the collisions are perfectly elastic, then find the time period (in second) of periodic motion. `(g = 10` `m// s^2 )`.

HINT

`T=2t_(PQ)`
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