- #1
*intheclouds*
- 19
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OK I have 1 more question for today...
A 0.45kg volleyball travels witha horizontal velocity of 3.2m/s over the net. You jump up an hit the ball back witha horizontal velocity 7 m/s. If the contact time is 0.047s, what is the average force on the ball?
Here are all the equations that were in our notes for this section.
p (momentum) There was triangle P and triange t in my notes, so I wrote "change in"
p=mv
f=ma
f*"change in"t="change in"p
f*"change in"t=mvf-mvi
"change in" P=mvf-mvi
Again, I wasnt really sure what equation to use...
[(.45kg)(-3.8m/s)-(.45kg)(3.2m/s)]/(.047s)
I got -67.0, but it wasn't right...
Please help...=]
Homework Statement
A 0.45kg volleyball travels witha horizontal velocity of 3.2m/s over the net. You jump up an hit the ball back witha horizontal velocity 7 m/s. If the contact time is 0.047s, what is the average force on the ball?
Homework Equations
Here are all the equations that were in our notes for this section.
p (momentum) There was triangle P and triange t in my notes, so I wrote "change in"
p=mv
f=ma
f*"change in"t="change in"p
f*"change in"t=mvf-mvi
"change in" P=mvf-mvi
The Attempt at a Solution
Again, I wasnt really sure what equation to use...
[(.45kg)(-3.8m/s)-(.45kg)(3.2m/s)]/(.047s)
I got -67.0, but it wasn't right...
Please help...=]