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That depends on the situation, on the problem you are trying to solve. If speed is constant, maximal centripetal acceleration occurs where the radius of curvature is smallest - for example, in the case of a parabola, at its vertex. If the radius of curvature is constant, maximum centripetal acceleration occurs when the speed is greatest (for an object reacting to gravity, that might be at the bottom of a circular path). In other cases, you have to get a general expression for the centripetal acceleration, and maximize it (using methods of calculus).
Usually you would use one of the formulae for constant acceleration, replace the variables you know, and solve for the variables you don't know.
Its acceleration is zero, which is constant
If your velocity is constant, then your acceleration is zero.
Acceleration must be constant to use kinematic equations. Acceleration need not be constant if working with energy.
Force = (mass) times (acceleration) Constant force produces constant acceleration.
Its not. Except that the rate of acceleration varies a lot, and in textbook examples its usually held constant to make it easier to solve the math.
If the velocity is constant then there is no acceleration. The acceleration is zero.
Unless the train is in a curve, you cannot have constant speed and constant acceleration. You either have constant speed and zero acceleration, or you have changing speed and constant acceleration. Please restate the question.
Constant speed means that speed doesn't change. Constant acceleration means that acceleration doesn't change. (If the acceleration is anything but zero, speed WILL change.)
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.
Yes - for a while. Or indefinitely, if you will accept zero acceleration as "constant acceleration".