variable velocity can be defined as a moving body whose velocity changes with time
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For an object moving at a variable velocity you:calculate the square of the velocityfind its mean valuecalculate its square root.If the velocity is constant then the RMS velocity has the same value.
instantaneous velocity
It is not a variable. The equation says that the energy contained in any given mass is equivalent to the mass times the velocity of light squared.
Answer: v=u + at v (Velocity) = u (Starting velocity) + a (acceleration) x t (time) So, starting from stationary (u=0), the velocity is simply a x t e.g. if the acceleration is 5mph per second per second, after 10 seconds you would be travelling at 50mph. Answer: The above is for constant acceleration. In the case of variable acceleration, integration has to be used.
The slope of a line on a position vs. time graph would represent the a velocity of the object being described.