1. A rock is dropped from a 100-m high cliff. How long does it take to fall the first 50-m, and the second 50-m?
2. A juggler usually tosses balls vertically to a height H. To what height must they be tossed if they are to spend twice as much time in the air?
3. Two objects are begin a free fall from rest from the same height, 1 second apart. How long after the first object begins to fall are the 2 objects 10 m apart?
4. A hot air balloon is ascending at a rate of 12 m/s and is 80-m above the ground when a package is dropped over the side. How long does it take the package to hit the ground, and with what speed does it hit the ground?
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