1. A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball in the air for a total time of 7.54s. What is its initial velocity? Neglect air resistance.

2.

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.27 m. The stones are thrown with the same speed of 8.19 m/s. Find the location (above the base of the cliff) of the point where the stones cross paths