Your 75 kg 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...

Your 75 kg 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 ( pt t ) + 160(1 - t/t ) where F(t) is in lbf. Here the push­off duration, t , is 180 ms. How high will your friend’s center of gravity be elevated at the peak of his jump.