Answer:
In the absence of external forces and at any point, the sum of the kinetic energy and the potential energy is always constant.
Explanation:
Conservation of energy just means that the total energy is unchanged.
Energy is made up of potential and kinetic, so if the total is unchanged, that means the sum of them is unchanged
To solve this problem we will apply the concepts related to the conservation of momentum. Momentum can be defined as the product between mass and velocity. We will depart to facilitate the understanding of the demonstration, considering the initial and final momentum separately, but for conservation, they will be later matched. Thus we will obtain the value of the mass. Our values will be defined as




Initial momentum will be


After collision

Final momentum


From conservation of momentum

Replacing,





Answer: B
Explanation: I'm not 100% sure tho sorry if i'm wrong
Answer
A softball has a (negative) acceleration when it is thrown. A soft ball has a (positive) acceleration when it is caughtExplanation: