A box with mass 13.0 kg moves on a ramp that is inclined at an angle of 55.0? above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is ?k = 0.300. Choose the x-axis along the surface of the ramp and the y-axis perpendicular to the surface. A. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 180.0 N that is parallel to the ramp surface and directed down the ramp, moving the box down the ramp.
B. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 180.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.

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