you need
  • calculator or a computer, speedometer
To calculate the average speed of the uniform motion of the object, just measure its speed at any point of the path.Since the speed is constant, then it is the average speed.
even easier, this dependence appears as a formula: Vav = V, where
Vav - average speed and
V - the speed of uniform motion.
To calculate the average speed of uniformly accelerated motion, get the arithmetic average of the initial and final speed.To do this, find the sum of these velocities and divide by two.The resulting number is the av
erage speed of the object.
visually it looks in the following equation: Vav = (Vkon Vnach +) / 2, where
Vav - average speed,
Vkon - ultimate speed,
Vnach - the initial velocity.
a nominal value of acceleration and initial velocity and the final velocity is unknown, then convert the above formula as follows:
Since uniformly accelerated motion Vkon = Vnach + a * t, where a - acceleration of the object, andt - time, we have: Vav = (Vkon + Vnach) / 2 = (Vnach + a * t + Vnach) / 2 = Vnach + a * t / 2
If, on the contrary,know the final velocity and acceleration of the body, but the initial velocity is not specified, then convert the formula to the following form: Vav = (Vkon + Vnach) / 2 = (Vkon + Vkon - a * t) / 2 = Vkon - a * t / 2
If you specify the length of the path traveled by the body, as well as the time it took to travel this distance, you simply divide the time spent on the road.That is, using the general formula: Vav = S / t, where S - the total length traveled puti.Vremya spent on the passage of the way is taken into account regardless of whether the object is continuously moving or stopped.
If the conditions of the problem is not specifically stated what is necessary to calculate the average speed, it is assumed average ground speed.
To calculate the average ground speed, takes the total length of distance traveled, ie,its trajectory.If during movement the object passed back to point the way, it also takes into account the distance.For example, for a vehicle path length required for computing the average ground speed will correspond to the speedometer (difference in the readings).
If you want to calculate the average speed of travel (displacement), then the traveled through is meant the distance that the body really moved.
Since movement always occurs in a certain direction, the displacement (S) vector quantity, i.e.It characterized as the direction and absolute value.Consequently, the average speed will be the magnitude of the displacement vector.Therefore, in dealing with such problems is required to find out: what kind of speed to be calculated.The average ground speed, the numerical value of the average velocity or displacement vector average speed of displacement.
In particular, if the body during the movement back to the starting point, it is considered that the average speed of displacement is zero.