- #1
GatorJ
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Homework Statement
A 0.5-kg rubber ball is dropped from rest a height of 19.6 m above the surface of the Earth. It strikes the sidewalk below
and rebounds up to a maximum height of 4.9 m. What is the magnitude of the impulse due to the collision with the sidewalk?
Homework Equations
J=[tex]\Delta[/tex]P
The Attempt at a Solution
mgh=.5mv2
v=[tex]\sqrt{}2gh[/tex]
Just before collision:
v=[tex]\sqrt{}2*9.8*19.6[/tex]
v=19.6 m/s
Just after collision:
v=[tex]\sqrt{}2*9.8*4.9[/tex]
v=9.8 m/s
J=m(vafter-vbefore)=.5(9.8-19.6)=4.9 kg m/s
The answer is 14.7 N.s, so I'm not sure what I'm missing.