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1.A helicopter, which is rising vertically at 20 m/s is 25 m from the ground when an object is dropped from it. How high will the object rise after it is released? For how long will it rise? What will be its speed as it reaches the ground?

2. A stone is dropped from a point 320 meters above the ground; at the same instant another stone is thrown upward from a point 100 meters below the first. I f the two stones strike the ground simultaneously, what is the initial velocity of the second stone.

3. An object is projected vertically upward from the ground. If its initial speed had been twice as great it would have risen 60 m higher. What was the speed of the projection of the object?