The answer is 5. To find the advantage you just divide 20 by 4.
Answer:
speed and acceleration
Explanation:
speed is a scalar quantity
acceleration is a vector quantity
By the work energy theorem, the total work done on the stone is given by its change in kinetic energy,

We have


Then the total work is

Because the electromagnets can pick up magnetic material and move it around, hope this helps
Generally speaking, negative ions increase the flow of oxygen to the brain resulting in higher alertness, decreased drowsiness, and more mental energy.