Build according to a graph of the problem the speed of the body from time to time v (t).Here, the horizontal coordinate represents time change (s), vertical - velocity (m / s).Typically, the problem is considered non-uniform motion of a body in regular intervals.Any change in the speed of the chart will be displayed in ascending or descending order.For example, at the beginning of the movement of the body with a constant acceleration within 20 sec as a result of its speed was 15 m / s.Put on the graph straight line starting at the origin (0, 0) and ends at the point (20, 15), where 20 are laid to the right along a time axis t, and 15 m / s - up speed.If there i
s a uniform motion of the body, display the line parallel to the horizontal axis.
To find the average velocity of the need to know the path and the time spent in traffic.Calculate the area S under the curve v (t), which is a graphical representation of the path traveled by the body movement of the graph L. limits trapezoid shape.Its area is given by: S = ½ * (t0 + t1) * vn, where t0 and t1 - the base of the trapezoid - of the chart speed, vn - the height of the figure is the maximum speed on the road.Substitute known values ​​into the formula and calculate the result.If the graph of v (t) is not a trapezoid, its area is calculated by different formulas, depending on the resulting figure.
Find the average velocity of the body by the formula Vav = L / t.Substituting a specified time and the calculated movement path, calculate the numerical value of the average velocity.
average speed can be calculated by plotting the path from time to time l (t).To do this, connect a straight line start and end points considered plot moving.The average speed of a body is equal to the slope of the resulting line to the time axis.