A hockey puck on ice is attached to a 0.50 meter radius pole with a 150 meter string. It swings around the pole at a speed of 24.0 radis initially. After the string wraps around the pole
20 times, how fast will the puck be moving (in rad/s)? Use conservation of angular momentum
not energy (since work is done by the tension in the rope, kinetic energy changes so it's not
conserved).

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

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