Answer on Mechanics | Relativity Question for marwa altir
A bicyclist races around a circular track and covers the same number of meters per second everywhere. Which one of the following is true?
a) The speed of the bicyclist is constant. b)The velocity of the bicyclist is constant.
The difference between speed and velocity is the fact that velocity takes into account the direction, while speed does not. In other ways, speed is the magnitude of velocity. Since the bicyclist covers the same number of meters per second, his speed is constant. Since he is moving around a circular track, his direction changes, so his velocity also changes. Therefore, the statement a) is true.
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