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tamir102
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Homework Statement
Two hockey pucks of equal mass undergo a collision
on a hockey rink. One puck is initially at rest, while
the other is moving with a speed of 5.4 m/s. After the
collision, the velocities of the pucks make angles of
33° and 46° relative to the original velocity of the
moving puck. Determine the speed of each puck after the
collision.
V1i=5.4m/s
m1=m2
V2i= 0
V1'=?
V2'=?
Homework Equations
P=P'
M1V1+M2V2=M1V1'+M2V2'
Eki=Ekf
1/2mv1i^2+1/2mv2i^2=1/2mv1'^2+1/2mv2'^2
The Attempt at a Solution
k so i understand we have two unknowns and thus we should have two unknown equations.
so ..
M1V1+M2V2=M1V1'+M2V2'
masses equal so they can be cancelled
and we know V2=0 so that whole part is removed
v1= v1'+v2'
5.4= v1'+v2'
5.4-v1'=v2'
^^ first unknown equation
now when i place it into 1/2mv1i^2+1/2mv2i^2=1/2mv1'^2+1/2mv2'^2
it does not give me the right answer or better yet i do not know how to continue on from this i always get
5.4-v2^2=5.4-v2^2+v2'^2
can someone please explain ...thank you in advance.