Both frequencies and amplitudes are needed to transfer energy through a water wave ..
A. When your fire a bullet into the air, it typically takes between 20 and 90 second for it to come down,depending on the angle it was fired at,its muzzle velocity and caliber.
If an object is on a frictionless surface, to keep it at a constant velocity you can’t apply any force because otherwise, the object will accelerate, and the velocity will change.
In the first law, an object will not change its motion unless a force acts on it. So I think the answer is A. Only objects that are moving.
