Answer:
D. 3 psi
Explanation:
Pressure is defined as force acting per unit area and is numerically expressed as:

where P represent pressure, F is force and A is area where the force acts. Substituting 300 lb for force and 100 sq.in for area then pressure,

Therefore, from the choices given, option D, 3psi is the right choice.
Answer:
the ground when the ball hits it
Explanation:
A ball falls freely towards the Earth. If the action force is the Earth pulling down on the ball, then identify which of the following best describe the reaction force: