What is the difference between speed and velocity? (a) magnitude
(b) direction
(c) nothing

(B) direction

Explanation: Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.