John and Leah want to move the piano in their living room. John pushes from behind the piano with a force of 300\text{ N}300 N300, start text, space, N, end text, and Leah pulls on a rope tied to the front with a force of 100\text{ N}100 N100, start text, space, N, end text. The piano has a mass of 200\text{ kg}200 kg200, start text, space, k, g, end text, and the friction force of the floor and the piano is 140\text{ N}140 N140, start text, space, N, end text. Calculate the acceleration of the piano.

50 meters per 5 seconds

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