Asked by ricki

someone swings down pendulem and rescue the lady in distress by grabbing her. inelastic collision at the equallibrium point o fthe pendulem. his mass is 90kg her mass is 50kg. what is the masimum height of the oppsite legde that he. he is standing on a 10m edge
Answered by bobpursley
Are you taking an exam?
Answered by ricki
NO is a homeowork problem that is due tommorrow and i cant figure out how to do it
Answered by bobpursley
Well, his initial position gives you the KE at the bottom, just before grabbing her. mgh=1/2 mv^2 or v= sqrt2gh

Now, when grabbing, figure conservation of momentum

(M+m)Vf=M(sqrt2gh) where M is his mass, m her mass. Find Vf.
Now, knowing the Vf, calculate the KE..

and set it equal to final GPE
1/2 (m+M)vF^2=(m+M)g*hf
solve for hf

a lot of algebra.
Answered by ricki
thank you so much
Answered by ricki
what is sqrt2
Answered by bobpursley
sqrt2 is the square root of 2, approximately 1.414
Answered by ricki
thanks i wasn't sure if it was just the 2 or the whole thing
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