155 MPH by Andy Roddick
A float serve is a serve with very little spin (preferably no spin) that moves much more than a top spin serve. It is performed by striking the ball with a flat palm and "paintbrushing" (not snapping your wrist).
A spinning top can reach speeds of up to several thousand revolutions per minute, depending on factors such as its weight, shape, and surface friction. The maximum speed is limited by the materials and design of the top.
The Gatekeeper is approximately 67 mph at Maximum/Top Speed.
Top speed is 85 mph.
The two over arm serves are called the top spin and the flote serve and the under arm serve
hit it with a normal backhand grip, striking upward
The top speed of a Boeing 787 is about 593 mph.
Top speed is 80 mph.
Top speed is 102 mph.
Maximum speed: Mach 2.5+ (1875mph, mach 2.443732)
A topspin serve in tennis is a serve where the player imparts forward spin on the ball, causing it to rotate forward as it travels over the net. This causes the ball to drop quickly and bounce higher when it lands, making it harder for the opponent to return. It is an effective serve for generating power and control.
whatever the top speed of a canal boat, the maximum allowed is 4mph or 2mph when passing moored boats