Ball hitting block, elastic collision

1. The problem statement, all variables and given/known data

.500kg ball attached to a cord that is 70 cm long. ball strikes a 2.5kg block at rest

what is the speed of the ball just before hitting the block
and collison is perfectly elastic find speed of ball and block after collision

2. Relevant equations



3. The attempt at a solution
Uo=MGY
(.5)(9.8)(.7)= 3.43J
Ko=0
Uf=0
J=.5(.5)v^2= 2.62

part b
2.62=V2f-V1f
1.31=.5V1f+2.5V2f

matrix on calc
V1f= -1.75
V2f=.87
 

ideasrule

Homework Helper
2,263
0
Re: Collision

I don't understand the question. Do you have a diagram? How is the cord attached? Is it a spring or something?
 

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