Unformatted text preview: .A‘x 7 1. A ball is dropped with no initial velocity of from the roof of a 30 m tall building and
falls to the ground below. A second identical ball is thrown up with an initial speed
of 8.0 m/s. It misses the building on the way down and falls to the ground. A third identical ball is thrown directly down towards the ground with an initial speed of
8.0 m/s. \ a-"éalculate the time the first, ball is in the air and its speed just before it hits the
ground. b. Calculate the time the second ball is in the air and its speed just before it hits the
ground. c. Calculate the time the third ball is in the air and its speed just before it hits the
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2. A stone is thrown upwards from the edge of a building roof that rs . 0m highrxi‘ stone just misses the edge of the building on the way down and hits the ground below
with a speed of 42 m/s. ,a’. What is the maximum height above the ground that the stone reaches?
b. What was the stone’s initial velocity in the up direction?
i 13c“ How long was the stone" ' _ 37(aLtm7-3 $1 .
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- Fall '08