The force on a mass moving at a constant speed and direction is 0.
If the speed is constant, then the group of forces acting on the object is balanced. So the portion of the force acting in the direction of the motion must be equal and opposite to the force of friction.
If you have a constant speed, you are not accelerating.
No force is required to keep an object moving at constant speed in a straight line. Force is required only to change its speed or direction.
An object will move at constant speed until acted upon by a force.
because there if speed is constant than ball never come back to earth hence speed of ball is not constant
It depends on your setting. If the net force on an object is zero than the object will move with a constant speed. It will also move with a constant speed (but not velocity!) if a force forces the object to move in a circular motion.
An object maintains a constant velocity when the net force acting upon that object is zero. Therefore, a force pushing against the object that exactly opposes the force(s) due to friction (in both magnitude and direction) will result in a net force of zero, and the object will maintain a constant speed.
how to compute the average speed of each athlete
There is a huge difference between constant speed and constant acceleration. Constant speed is when the object is travelling constant, no change in its velocity and acceleration or in other words no extra force to speed up. Constant acceleration when the object is acceleration constant, it means that the speed of the object is change at the same rate each second. The acceleration rate at which the object is travelling is constant. for example, when a car is stationary at a traffic light and it starts acceleration, picking up speed but the rate of acceleration will not constant because the amount of force applied differs each second due to the acceleration rate.
If the net force on an object is zero, then velocity of the object is constant ... it moves in a straight line at a constant speed.
-- An object with no net force on it continues moving at constant speed in a straight line.If it's not moving in a straight line, then there must be net force acting on it.-- "Acceleration" is the word for the situation where either speed or direction of motion changes.Even if speed is constant, acceleration is present if the direction is changing.
You need distance in kilometers or meters and time in hours or seconds to compute speed. To compute speed, simply divide the distance covered by the total time taken.