Question

question 19
1 pts
a feather and a coin dropped in a vacuum fall with equal
accelerations.
kinetic energies.
forces due to gravity.
none of these
question 20
1 pts
a ball rolling down an incline has its maximum potential energy at
the bottom.
a quarter of the way down.
the top.
halfway down.

Explanation:

For Question 19, in a vacuum, all objects fall with the same acceleration due to gravity (9.8 m/s² near Earth's surface), regardless of mass. Kinetic energy depends on mass and velocity, and gravitational force depends on mass, so they are not equal for a feather and a coin.
For Question 20, gravitational potential energy is given by $U = mgh$ (where $m$ is mass, $g$ is gravitational - acceleration, and $h$ is height). The higher the object, the greater its potential energy. So a ball rolling down an incline has maximum potential energy at the top.

Answer:

Question 19: A. accelerations
Question 20: C. the top