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Your 160 lbm friend agrees to have his standing jump analyzed. Standing
on a force plate, he crouches to lower his center of gravity, then executes
a jump. The force plate measurement gives a reading that can be described
by the equation
(=)
F(t) = 480 sin
+ 160 (1 – t/t)
(10.27)
where F(f) is in lbf. Here the push-off duration z is 180 ms. How high will
your friend's center of gravity be elevated at the peak of his jump?

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