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A small ball `A` is.thrown up with a velocity `40 m / s` from the ground. Another identical ball `B` of same mass is just dropped from a height of `50 m` simultaneously at time `t=0` so that both collide in air and stick together. Find the value of `t` (in s) at which combined mass will fall to the ground. `(g=10 m / (s)^(2))`
'(##CEN_KSR_PHY_JEE_C08_E01_023_Q15##)'

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