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A particle is thrown at t = 0, with an i...

A particle is thrown at `t = 0`, with an initial velocity `sqrt(11)hat(i)+35hat(j)`, where `hati` is along horizontal & `hat(j)` is along vertically upward direction. The acceleration due to gravity is `10 m//s^(2)` in invertically downward direction. The time instant(s) at which the speed of the particle becomes `6 mm/s` is//are

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