As an apple falls from a tree, which types of energy are changing?
O
A. Elastic energy and sound energy
O
B. Light energy and gravitational potential energy
O
C. Kinetic energy and nuclear energy
O
D. Gravitational potential energy and kinetic energy

D: Gravitational potential energy and kinetic energy

Explanation:

When an object (in your case an apple) has gravitational potential energy, it is still but has potential energy which is stored energy. As it falls, that potential energy transfers into kinetic energy.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.