ANSWER 1: Consider any solid comprising a lattice of molecules, moving at constant speed, say in the vacuum of space. The electrons within the atoms of the molecules are subatomic "objects" whose position and instantaneous velocity are best described by a probability density field equation, whose surface lies within the lattice of atoms within the solid. At any instant in time, the position and velocity of the electrons is not a constant, whereas the "speed" of the electrons which is their velocity averaged over say one second is the same as that of the solid comprising the lattice of molecules.
ANSWER 2: Consider a "photon" of light which may be regarded as an object (since it is a fundamental particle). As we all know the speed of light is a constant = C. However when passing near a massive object (eg black hole) the photon travels along the shortest path of the curvature of space-time in the vicinity of the massive object. Relative to the photon, its speed is and always has been = C. However when the speed of the photon is measured by a distant observer, it appears that for the period while under the influence of the curvature in space-time near the massive object, the velocity of the photon has varied. Hence the apparent shift in position that occurs when stars are observed in the vicinity of a black hole. In the limit, at the event horizon of a black hole, photons are apparently "slowed" to the extent that their velocity is no longer measurable by the remote observer, hence the inside of a black hole is "black", devoid of light.
These answers provided by Rob Sherratt 18th July 2009
Objects moving in uniform circular motion will have a constant speed, and two objects with the same acceleration have a constant velocity.
Velocity is Speed in a given direction. Moving at constant velocity is equivalent to say moving with a constant speed in a specified direction. So, moving at constant velocity implicitly means moving with constant speed.
Objects moving at constant speed in a straight line are said to be in equilibrium. That is there is no force acting on them. If a force was acting there would be aceleration and the velocity would change.
A car moving at constant speed in a straight line is also moving at constant velocity.
there is no acceleration if the body is moving with constant velocity
Objects moving in uniform circular motion will have a constant speed, and two objects with the same acceleration have a constant velocity.
When all forces are balanced, the object can either be moving at a constant velocity or be at rest. But because you asked for balanced forces on a moving object, it is moving at a constant velocity.
Velocity is Speed in a given direction. Moving at constant velocity is equivalent to say moving with a constant speed in a specified direction. So, moving at constant velocity implicitly means moving with constant speed.
friction
Objects moving at constant speed in a straight line are said to be in equilibrium. That is there is no force acting on them. If a force was acting there would be aceleration and the velocity would change.
When acceleration is zero, then the object is moving in a straight line with constant speed. (That's the effective meaning of constant velocity.)
Inertia
a "body" "moving body" an "object" is moving with constant velocity. [OR] a "body" is moving with constant velocity.
A car moving at constant speed in a straight line is also moving at constant velocity.
there is no acceleration if the body is moving with constant velocity
since accelaration is the change in velocity of an object per unit time......if velocity is zero then there is no acceleration.its nt possible
A motion with a constant speed will always be moving the same speed A motion with a constant acceleration will constantly be gaining speed, and does not remain moving at the same speed.