An object of mass 20 kg is pulled 7 metres at a constant speed across a rough horizontal floor by means of a horizontal rope. The tension in the rope is 100 N. Calculate the work done
between the object and the floor. State also the work done against resisting forces
by the rope. State the work done by the weight of the object and the normal contact force

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 

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