A body is projected up such that its position vector varies with time as `vecr={3thati+(4t-5t^(2))hatj} m`. Here `t` is in secon

A body is projected up such that its position vector varies with time as `vecr={3thati+(4t-5t^(2))hatj} m`. Here `t` is in second.The time when its `y`-coordinate is zero is

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A body is projected up such that its position vector varies with time as `vecr={3thati+(4t-5t^(2))hatj} m`. Here `t` is in second.The time when its `y

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