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 . Time taken by projectile to fall down is and boat to cross river is . Width of river is .
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1 solution
They both can be considered as same projectile as a is at 15 degree to the velocity and equal to g, v is also same.
Therefore time taken will be more in ground as range is more as range of boat is 1.0 m and that of ground is 25/19.6=1.27 m.