Question

A piece of putty of mass **m = 0.75 kg** and
velocity **v = 2.5 m/s** moves on a horizontal
frictionless surface. It collides with and sticks to a rod of mass
**M = 2 kg** and length **L = 0.9 m**
which pivots about a fixed vertical axis at the opposite end of the
rod as shown. What fration of the initial kinetic energy of the
putty is lost in this collision?

**KE _{lost}/KE_{initial}** =

Answer #1

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