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A football is thrown vertically upward with a speed of +20.0 m/s.
(a) Find how high does it rise?
m
(b) Find how long does it take to reach its highest point?
s
(c) Find how long does the ball take to hit the ground after it reaches its highest point?
(d) Find its velocity when it returns to the level from which it started?
m/s
A 87-kg snow skier is being pulled up a 10 ° slope by a steel (Young's modulus 2.0 x 1011N/m2) cable. what is the original (unstretched) length of the cable
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