(Solved): A ball is dropped from a boat so that it strikes the surface of a lake with a speed of \( 9.50 \ma ...

A ball is dropped from a boat so that it strikes the surface of a lake with a speed of \( 9.50 \mathrm{ft} / \mathrm{s} \). While in the water the ball experiences an acceleration of \( \mathrm{a}=11.00-0.90 \mathrm{v} \), where \( \mathrm{a} \) and \( v \) are expressed in \( \mathrm{ft} / \mathrm{s}^{\wedge} 2 \) and \( \mathrm{ft} / \mathrm{s} \), respectively. Knowing the ball takes 4 s to reach the bottom of the lake, determine the speed of the ball when it hits the bottom of the lake.