- #1
paola8
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1. A particle of mass m1 = 2 kg moving at speed u1 makes a one-dimensional completely inelastic collision with a particle of mass m2 = 3 kg, intially at rest.
If 60 J of kinetic energy are lost, find u1?
2. Conservation of linear momentum:
m1u1 + m2u2 = m1v1 + m2v2
3. Using the conservation of linear momentun formula...
2u1 + 3(0) = (m1 + m2)V
2u1 = 5V
I'm just not sure where the 60 J of ke lost fits in. The loss in kinetic energy of 60 J means
Kfinal - Kinitial
which is
[.5(m1 + m2)v^2] - [((.5)m1u^2) + ((.5)m2(0)]
But there still remains the unknown variable of u, meaning I went in a circle.
If 60 J of kinetic energy are lost, find u1?
2. Conservation of linear momentum:
m1u1 + m2u2 = m1v1 + m2v2
3. Using the conservation of linear momentun formula...
2u1 + 3(0) = (m1 + m2)V
2u1 = 5V
I'm just not sure where the 60 J of ke lost fits in. The loss in kinetic energy of 60 J means
Kfinal - Kinitial
which is
[.5(m1 + m2)v^2] - [((.5)m1u^2) + ((.5)m2(0)]
But there still remains the unknown variable of u, meaning I went in a circle.
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