A volleyball is released three times from three different heights: 5 m, 10 m, and 20 m. Which statement is correct about the volleyball? The volleyball accelerates more quickly toward the ground when released from a higher height.

The volleyball accelerates the same amount toward the ground each time.

The volleyball accelerates more slowly toward the ground when released from a higher height.

The volleyball may accelerate more quickly or slowly depending on its mass.

A student is setting up an experiment with 10 different balls. The student wants to measure which ball hits the ground with the largest force when released from a box 5 feet above the ground. Which quantity should be measured to correctly calculate the force with which each ball hits the ground?

the initial velocity of each ball
the mass of each ball
the rate at which the velocity of each ball increases
the final velocity of each ball right before hitting the ground

The concepts of free fall and Newton's second law allow to find the correct answers

1) Acceleration is constant

2) The mass of the body

The game of volleyball consists of throwing the balls from the serve to pass it to the other court, this is a two-dimensional movement type projectile launch, in this type of movement the acceleration is the constant on the y axis, it is called acceleration of the gravity and vale (g = 9.8 m / s²)

1) Let's review the different statements of the first part regarding acceleration.

a) The ball accelerates faster as it goes down

   False. Acceleration is constant

b) The ball accelerates the same amount

   True. Acceleration is constant and directed on the vertical axis

c) The ball accelerates slower or faster

     False. Acceleration is constant

The vertical launch of kinematics, establishes that the ball as it descends it goes faster with an acceleration equal to the acceleration of gravity, in this part it is asked to look for the force of the ball when it reaches the ground, for this the second is used Newton law

           F = m a

where in this case the acceleration is the acceleration of gravity

          a = g

          F = m g

Let's review the different claims

a) Initial velocity

    False. To calculate the force you only need the mass since acceleration is constant

b) The mass

    True. The product of the mass and the acceleration of gravity gives the force with which the ball hits the ground

c) Increasing speed

    False. Increasing speed allows calculating acceleration not force

d) The final speed

     False. Force does not depend on the speed of the body

In conclusion using the concepts of free fall and Newton's second law we can find the correct answers:

1)  Acceleration is constant

2) Body mass

Learn more about free fall and Newton's second law here:

link

Explanation:

1)

The answer is

The volleyball accelerates the same amount toward the ground each time.

Because gravitational acceleration is constant irrespective of altitude(height) or mass of the object.

2)

The answer is

the mass of each ball

because gravitational force is given by

F = mg

since g is a constant, he only needs to measure the mass if each ball

measuring things 1 litre of water