What is the instantaneous velocity v of the particle at t=10.0s?
What is the instantaneous velocity v of the particle at t=10.0s?
The instantenous velocity is just the slope of the graph at a certain instant. Since the graph is a straight line, its instantenous velocity is uniform through out. v = dx / dt = (40 - 10) / (50 - 0) = 0.6 m/s.
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The instantaneous velocity of the particle is 0.600 m/s. Instantaneous velocity is the velocity of an object at any given time in its path.
The instantaneous velocity of an object can be determined graphically in a position - time graph.
To get the slope of a line, get the ratio of the rise and the run.
In the given problem, the velocity of the object is constant because its position - time graph shows a straight line. As such, the instantaneous velocity will be equal to the average velocity.
To solve for the average velocity, use the equation below:
\(average \ velocity \ = \frac{displacement \ ( \Delta y)}{ time \ (\Delta x)}\)
Using data from the graph,
\(average \ velocity \ = \frac{40\ m - 10 \ m}{50 \ s \ - 0 \ s} \\average \ velocity \ = \frac{30 \ m}{50 \ s}\\ \\ \boxed {average \ velocity = 0.6 \frac{m}{s}}\\\)
The instantaneous velocity expressed with 3 significant figures like the given in the problem, therefore, is 0.600 m/s.
Keywords: instantaneous velocity, position - time graph