Asled weighing 300 n is moved at constant speed over a horizontal floor by a force of 50 n applied parallel to the floor
determine the coefficient of friction between the sled and the floor

If the sled is moving at a constant speed, that mean there needs to be an equal but opposite force countering the 50 N force. This opposite force is friction, and is equal to the weight times a factor:

F = n*W

Let n be the coefficient of friction.

Now you simply fill in the formula and you get:

50 N = n*300N or n = 50N / 300N = 1/6

So, the final answer is 1/6 or 0.1667

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Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction