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**[SOLVED] Elastic and Inelastic**

A 100 g block on a frictionless table is firmly attached to one end of a spring with k = 29 N/m. The other end of the spring is anchored to the wall. A 25 g ball is thrown horizontally toward the block with a speed of 5.9 m/s.

Q1: If the collision is perfectly elastic, what is the maximum compression of the spring?

Q2: in a perfectly inelastic collision, what is the maximum compression of the spring?

For Q1 I tried to use:

(1/2)mvi^2+(1/2)kx^2 = (1/2)mvf^2 + (1/2)kxf^2

and got change in x was .44 m, but it wasn't right...

I did the same thing for the other part, and it was still wrong...please help.

Oh, and I found the velocity of the ball after collision:

Perfectly Elastic: vf=3.5m/s

Perfectly Inelastic: vf=1.2m/s

These were right.