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A sprinter in a 100 dash accelerates uniformly from rest reaching a top speed of 14.7 m/s after 6.00 seconds. He then runs at constant speed for the rest of the race. What is his rate of acceleration during the initial phase of the race?
a = ∆v/∆t = (14.7 − 0)/6.0 = 2.45 m/s2
For the above position-time graph during which interval is the average velocity greatest.
a) OA., During this interval ∆x/∆t is largest.
During which interval is the instantaneous velocity of the particle greatest?
d) CD, Instantaneous velocity is the slope of the position time graph.
An objects speed is a measure of what?
how fast an object is moving
What force changes with speed?
Air resistance
What is trajectory vs displacement?
Trajectory is the path taken by a moving object over time, displacement is the shortest distance between origin and end and also direction taken by the object.
Every action has...
an equal and opposite reaction.
An accelerating body must at all times
have a changing velocity; acceleration means that the velocity is changing
An object goes from one point in space to another. After it arrives at its destination is the displacement the same, greater, or less than the distance traveled?
its displacement is never larger than its distance traveled
What is hooks law equation?
F=kx
Elastic materials, and objects such as springs, change shape when a force is exerted on them, a change in shape like this is called what?
Deformation
What are forces?
a push or pull that causes a change in speed, direction or shape, some forces are affected by speed, all forces come in pairs


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