Guide
1
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.
2
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.
3
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.
4
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.