Both are at the side of the spectrum that has the lower frequency
A would be the correct answer. Its the only one to make sense since you are trying to solve the conflict!
The independent variable is what type of powder is used, the dependent variable is how long itching lasts and the constant is the amount of powder used (50 grams)
If net external force acting on the system is zero, momentum is conserved. That means, initial and final momentum are same → total momentum of the system is zero.
