Average speed can be calculated by division of length of the way passed by a body into time spent for it. But in practice at the solution of physical tasks it is important to remember also some special nuances.
Instruction
1. Calculate the average speed of the body moving evenly throughout all site of a way. Such speed is calculated most simply as it does not change on all piece of the movement and equals average speed. It is possible to write down it in the form of a formula: Vrd = Vcp where Vrd is the speed of uniform motion, and Vcp is average speed.
2. Calculate the average speed of the ravnozamedlenny (uniformly accelerated) movement on this site for what it is necessary to put initial and final speed. Divide into two the received result which will be average speed. It is possible to write down it more visually as a formula: Vcp = (Vn + VK)/2 where Vn represents initial speed, and VK - final.
3. Use special option of the formula given above if the size of acceleration and initial speed are known, but final speed is not set. Designate acceleration as coefficient of" a" and receive a formula: VK = a * t + Vn. From here: Vcp = (Vn + VK)/2 = (a * t + Vn + Vn)/2 = a * t/2 + Vn.
4. Transform the formula given above if initial speed is unknown, but acceleration and final speed are set: Vcp = (Vn + VK)/2 = (VK + VK - a * t)/2 = VK - a * t/2.
5. Calculate average speed if length of the passable way (S) and time (t) spent for its passing are given, having divided them. The classical formula is for this purpose applied: Vcp = S/t. Remember that it is necessary to consider completely time even if an object stopped when passing the site.