Elastic collision between 3.42g and 6.84g objects

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snowbelle
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a 3.42g object moving to the right at 16.4 cm/s makes an elastic head-on collision with a 6.84g object that is initially at rest. find the velocity of the first object immediately after collision. Answer in units of cm/s. What fraction of the initial kinetic energy is transferred to the 6.84g object?

I don't understand how to do this problem. I think for the first part is it
M1v1i+M2V2i=M1V1f+M2V2f
and I am lost after that. I completely don't get part 2
 

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Indeed, you have:
[tex]P_{\rm{initial}}=P_{\rm{final}}[/itex]<br /> which gives you one equation.<br /> <br /> But, you have two unknowns ([itex]v_1[/itex] and [itex]v_2[/itex]), so you'll need another equation. What do you know about elastic collisions?[/tex]
 
energy and momentum is conserved in elastic collisions?
 
snowbelle said:
energy and momentum is conserved in elastic collisions?

Right. The equation you have listed only deals with momentum.
 
hmm i still don't get it
 
snowbelle said:
hmm i still don't get it

Can you write expressions for the total kinetic energy before and after the collision?