About 100 MPH.
The invention of the slapshot is credited to Bernie Geoffrion of the Montreal Canadiens, hence the nickname ("Boom Boom").
Bobby Hull is credited with the hardest slapshot on record, clocked on one occasion at a speed of 118.3 mph, whereas the more typical NHL slapshot is around 100 mph.
A former goaltender ...
Gord
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Average speed is an average value of speed over a given time. If your speed is constant (not changing), then your average speed will equal your speed at any given moment in time.
average speed = distance / time
Instantaneous speed is the speed at a particular moment in time.The average speed of an object tells you the (average) rate at which it covers distance
velocity is a vector and speed is scalar. Velocity has magnitude and directions, with magnitude being speed. The magnitude of average velocity and average speed is the same.
The concept of average speed is somewhat simpler than "instantaneous speed".