They both are pretty much the same.
Explanation:
a) The height of the ball h with respect to the reference line is
so its initial gravitational potential energy is
b) To find the speed of the ball at the reference point, let's use the conservation law of energy:
We know that the initial kinetic energy as well as its final gravitational potential energy are zero so we can write the conservation law as
Note that the mass gets cancelled out and then we solve for the velocity v as
The idea that "students ' immune systems have declined due to the use of hand sanitizers " is a hypothesis.
The term hypothesis refers to an intelligent guess or idea often based which is subject to scientific investigation via experiments.
A hypothesis may be right or wrong. We can only prove a hypothesis by subjecting it to a series of rigorous experiments.
Thus Collette's idea is a hypothesis.
Learn more: brainly.com/question/18284466