In tennis, the average speed of a serve for a man can range from from 70mph up to the world record of 163.7 mph. A pro would average in the high end, 120-130mph.
As of March 2014, the fastest professional serve speed for a man is held by Samuel Groth at 163.7mph (263.4 km/h). This was set at the 2012 Busan Open Challenger Tennis.
Additionally, other top speed servers include:
Height does seem to play a factor in how fast a player can serve the ball.
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in international play men average in the low-mid 60s (mph). some can serve upwards of 80 mph though
That depends on many factors including the person's strength, the speed at which the volleyball is hit at the person who will spike it and the angle at which the arm is swung.