Projectile Boat!

A ball is thrown at initial velocity 5 at an angle 15 degree from horizontal and at the same time a boat of velocity 5 at angle 165 degree from the direction opposite to river acceleration is placed in a small river of velocity 0 and acceleration \(g=9.8\text{ m/s}^2\). Time taken by projectile to fall down is \(t_1\) and boat to cross river is \(t_2\). Width of river is \(1.0\text{ m}\).

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