We are to show that the given parametric curve is a circle.
The trajectory of a circle with a radius r will satisfy the following relationship:

(with (x_c,y_c) being the center point)
We are given the x and y in a parametric form which can be further rewritten (using properties of sin/cos):

Squaring and adding both gives:

The last expression shows that the given parametric curve is a circle with the center (0,0) and radius A.
Answer:
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No, because in oxygen depraved rooms, if you drop a feather and a bowling ball at the same height and time, they will fall at the same speed and have the same amount of impact.
Answer:
force-strength,power or energy as an attribute of motion, movement or action. Example: Frictional force.