(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 2.0 kg ball moving with a speed of 3.0m/s hits, elastically, an identical stationary ball as shown. If the first ball moves away with angle 30 to the original path, determine

a) the speed of the first ball after the collision.

b) the speed and direction of the second ball after the collision

2. Relevant equations

m1v1 + m2v2 = m1v1' + m2v2'

1/2 m1v1^2 + 1/2m2v2^2 = 1/2 m1v1'^2 + 1/2 m2v2'^2

3. The attempt at a solution

X component:

v1 = v1' + v2' (since v2 is 0, and m's are equal)

Y component:

v1' = v2' (since v1 and v2 are 0 and m's are equal)

Because of this, does this mean that the angles should be equal as well?

I'm very confused about what I can deduce and assume from the identical mass of the balls..

It'd be great if someone could point me in the right direction. Thanks!

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# Homework Help: 2d momentum of identical without final velocities, but given angle of first object

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