Question
Tue September 18, 2012 By:
 

a man throws a ball of mass 0.5 kg vertically upward with a velocity of 25 m/s find a)the initial momentum of the ball b)momentum of the ball at the half way mark of the maximum height (given g=1o m/s square

Expert Reply
Tue September 18, 2012
inital momentum: mu = 7.5 kgm/s
 
initial kinetic energy: K= 1/2 mu2
At max hieght, Potential energy: PE = mgH
thus PE = K     (conservation of energy)
H =u2/2g
 
at midway height let velocity be v
thus total energy there E = 1/2mv2 + mgH/2
and now equating K = E
thus now we can find v this equation
and momentum at mid height will be = mv
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