(Solved): Example: A ball is thrown vertically upward from the 12m level in an elevator shaft with an i ...

Example: $?$ A ball is thrown vertically upward from the $12\mathrm{m}$ level in an elevator shaft with an initial velocity of $18\mathrm{m}/\mathrm{s}$. At the same instant an open-platform elevator passes the $5\mathrm{m}$ level, moving upward with a constant velocity of $2\mathrm{m}/\mathrm{s}$. Determine (a) where the ball will hit the elevator, (b) the relative velocity of the ball with respect to the elevator when the ball hits the elevator.