1.
Block
1, M1 = 3 kg, slides without friction on a surface at 4 m/s and
collides with and sticks to block 2, M2 = 5 kg, initially at rest.
a) What is the velocity of the blocks after the collision? b) Is this collision
elastic? c) What fraction of the original KE is lost?
We do
not know if the collision is elastic or not, so the only rule we know works is
the law of conservation or energy.
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Let’s
check to see if this collision is elastic.
KE3 +
KE5 = KE3’ + KE5’
Note that in building a fraction, when the syntax is of the form “…what fraction of ___ is ___”, what follows the word “of” goes to the denominator; what follows “is” goes to the numerator.