Question

A baseball is thrown vertically upward and feels no air resistance. As it is rising:

Answer 1

Answer:

C) Its momentum is not conserved, but its mechanical energy is conserved.

Explanation:

There is no air resistance acting on the ball: this means that there are only conservative forces acting on the ball, therefore the total mechanical energy of the ball is conserved.

The total mechanical energy is defined as

$E=U+K$

where

U is the gravitational potential energy

K is the kinetic energy

The gravitational potential energy is given by:

$U=mgh$

where m is the mass, g the acceleration of gravity, h the heigth - since the height change, U changes as well, so the potential energy is not conserved.

The kinetic energy is given by

$K=\frac{1}{2}mv^2$

where v is the speed of the ball: as the ball rises, its speed decreases, so the kinetic energy is not conserved as well.

The momentum of the ball is given by:

$p=mv$

As we stated above, the speed of the ball is decreasing, so v is decreasing, and this means that the momentum is also not conserved.

So the only correct choice is

C) Its momentum is not conserved, but its mechanical energy is conserved.

Answer 2

A baseball is thrown vertically upward and feels no air resistance. As it is rising:  C. its momentum is not conserved, but its mechanical energy is conserved.

Explanation:

Baseball is a sport played on a field by two teams that against each other. A player on one team throws a small round ball at a player on the other team who tries to hit it with a bat. Momentum is the quantity of motion that an object has. Momentum can be defined as "mass in motion." Whereas mechanical energy is the sum of kinetic and potential energy in an object that used to do work. Mechanical energy is energy in an object due to its motion or position, or both.

Momentum is the mass m multiplied by velocity v so momentum may be conserved if a change of mass is complemented by a change of velocity. Energy and momentum are always conserved. Momentum can be conserved if mechanical energy is not conserved although In a perfect scenario mechanical energy is always conserved, therefore the kinetic energy is not conserved in an inelastic collision because it is converted to another form of energy (heat, etc.). The sum of all types of energy including kinetic is the same before and after the collision

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