So basically I have a homework question that says:
Block 1 (m1, Vo) hits block 2 (m2, Vf) at rest. Block 1 rebounds at Vf1, and block 2 moves forward at a speed not given.
So m1, Vo, m2, and Vf1 are given, but Vf2 must be calculated. My question is how is it that in the end energy is lost?
Final equation: delta KE= (m1•Vf1^2/2+m2•Vf2^2/2)-m1•Vo^2/2
And Vf2=(m1•Vo-m1•Vf)/m2
So if all numbers are calculated why is there energy loss?
In: 0
Kinetic energy should be conserved in this problem. If you are getting a change in kinetic energy then you must be making an error.
I’m guessing you need to reverse the sign of Vf1. Your book probably provides you with speeds, but velocity is also about direction. If block 1 is rebounding then it should be moving in the negative direction after the collision and Vf1 should be negative.
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