Conservation of momentum?
A particle of mass "m:" moving under an impetus of intensity "p" plunges into the surface of a lake and all of its energy is lost to the water. What does the impetus cause to happen in the water? Does all the forward tendency of motion of the particle get lost?
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answers:
RealPro say: That sounds like something straight outta 13th century. "Impetus" is not a physical quantity. I assume you mean momentum.

The momentum of the particle gets transfered to the water, then to the soil below, and eventually the entire Earth, pushing the entire planet by a tiny amount. Of course, if the particle was originally lying on the Earth, then the collision just brings the centre of momentum to where it was before the particle was picked up or whatever.
The kinetic energy of the particle is converted to the kinetic energy of the waves and sound, which eventually turn to heat.
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