Problems with gravity. Assume no air resistance.
1. An object is dropped from rest. How far could it fall in 3 seconds?
2. How fast would it be moving after 3 seconds?
3. If you drop a rock from a 30-m high bridge into the water below, how long will it take to hit water?
4. Imagine throwing a ball straight up into the air, with an initial speed of 25 m/s. Hint: it may be wisest to call UP positive, which makes gravity negative.
a. How long will it take to reach apogee?
b. How high will it rise?
c. How long will it take for the ball to return to your hands?
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