Homework Help: Physics

Posted by AH on Thursday, October 25, 2012 at 8:02pm.

A 0.4 kg ball strikes a smooth level floor with a velocity of 5.0 m/s, 60 degrees below the horizontal. It rebounds off the floor with an unknown velocity and reaches a maximum rebound height of 0.60 m. If the duration of the collision with the floor is 50 milliseconds, then what was the average (magnitude of the) normal force (in Newtons) the ground applied to the ball?

Hint: Use the impulse-momentum theorem.

Physics - Kai, Thursday, October 25, 2012 at 10:57pm
haha i think i am in the same physics class with u...
Physics - Doon, Thursday, October 25, 2012 at 11:54pm
Me too haha. Hope someone solves it soon...
Physics - ian, Friday, October 26, 2012 at 12:31am
kaminsky hooray :p
Physics - AH, Friday, October 26, 2012 at 12:52am
LOL

Welcome to the club guys :P
Physics - Phil, Friday, October 26, 2012 at 1:06am
hah I love how everyone in physics with Kaminsky is looking here
Physics - Mike, Friday, October 26, 2012 at 1:28am
I don't wanna write it all out so I'll just give you the general formula.

#2: vf=√[2*(m_1gLsinθ-m_2gL-0.5kL^2-μkm_1gcosθL)/(m1+m2)]
Just to be clear, all of those values^^^ are under the square root sign.

#4: v1f=[(v1)(m_1-m_2)/(m_1+m_2)]+[(v2)2m_2/(m_1+m_2)]
I'm pretty sure this formula was in this notes, but make sure your answer is positive.
Physics - ian, Friday, October 26, 2012 at 1:51am
i cant get the answer... thx for the help tho mike.

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