Change in position and the time taken for the change in position.
That depends on what information is provided. If you don't have any information, you may actually need to measure the speed of the water; or you may want to measure the flow (for example, in liters per second), and the pipe diameter, and then calculate the speed from that.
Speed and Velocity are two different things . Velocity- "the rate at which an object changes its position." Speed- "How fast an object is moving". To calculate speed and velocity, you first need to calculate distance and time. Velocity is considered to be a more logical term
You need to know it speed, wavelenght and its frequency.
There is not enough information to be able to answer this with a number. To get an answer, you need to know what the fuel consumption is for the plane and then you need to know what direction and how strong the winds are. Knowing the wind speed will allow you to calculate your ground speed.
You need speed to calculate this. Distance is speed / time
You need speed to calculate this. Distance is speed / time
You need speed to calculate this. Distance is speed / time
Not enough information. You also need to know how much the acceleration is. Once you know that, calculate the final speed, then calculate the average speed as (initial speed + final speed) / 2, and multiply that by the time to get the distance.
You need speed to calculate this. Distance is speed / time
Perhaps you better ask another question, specifying what you DO have. You do need some information to calculate the speed. You can divide distance / time, or you can use the Doppler effect if you have the specialized equipment.
Need average speed to calculate.
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).