Brianna weighs 425 N. She climbs a flight of stairs to a height of 8 m. It takes her 6 seconds.
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Answer:
Average speed: 0.5 m/s. Average velocity: 0
Explanation:
Average speed is given by:
where
d is the total distance covered (the length, of one lap of the track, so d = 400 m)
t is the time taken to cover that distance (so, t = 800 s)
Substituting,
Instead, average velocity is defined as
where this time,
d is the displacement, which is the vector connecting the starting point to the final point of the motion
t is still the time taken (800 s)
However, in this case the walker starts and finishes his trip at the same point: therefore, the displacement is zero (d=0), and this means that the average velocity is zero as well.
Generally, the symbol 
is used to indicate the angular velocity.
In a circular motion, the angular velocity is defined as the time rate of change of the angular displacement, relative to the origin. If we call
the angular displacement of an object relative to the origin, and t the time, the angular velocity can be written as
and it is measured in radiants per second (rad/s).
In a circular motion, the angular velocity is defined as the time rate of change of the angular displacement, relative to the origin. If we call
and it is measured in radiants per second (rad/s).