It is useful because you can tell how long it will take you to get somewhere or you can tell how long you will be running if you keep a steady pace.- S.E.F
When an object is stationary and does not travel, calculating its average speed is not useful since there is no displacement or time taken to travel. Average speed is typically used to measure how fast an object moves over a period of time, which does not apply to a stationary object.
the speed
I'm sure that average speed would be easier to calculate than instantaneous speed. To calculate average speed, just take the time that it takes to travel between two points, and divide that into the distance between the points.
One can calculate the cost of electricity by using several useful websites such as WebMath or Handy Math. Another example of a useful website is CSGNetwork.
Speed = Wavelength X Frequency
time = distance ÷ speed
Speed = Wavelength X Frequency
That is just not true! If you can calculate its average speed you should be able to calculate its speed at any point in time during its flight, including its final velocity.
You can calculate speed by dividing the force by the mass to get acceleration, and then multiplying the acceleration by time. Speed = acceleration x time.
To calculate force when given speed, you would need to know the mass of the object. The equation that relates force, speed, and mass is F = m*a, where F is the force, m is the mass, and a is the acceleration (change in speed over time). Without knowing the mass or acceleration, it is not possible to calculate the force.
You can calculate a wave's frequency by dividing the speed of the wave by its wavelength. The formula is: frequency = speed of wave / wavelength.
Speed times Time = Distance