A person is attracted toward the center of Earth by a ...

[Engineer]

A person is attracted toward the center of Earth by a gravitational force of 500 N. The force with which Earth is attracted toward the person is
 
  1) 500 N
  2) infinitesimally small
  3) billions and billions of tons
 
  principally because
  4) the forces in question make an action/reaction pair.
  5) the mass of the person is negligible compared to the mass of Earth.
  6) Earth itself weighs billions and billions of tons.
  7) of inertia.

Question 2

In the absence of air resistance, a boulder and a pebble dropped from rest will fall with equal
 
  1) forces of gravity.
  2) accelerations.
  3) energies.
  4) all these.
 
  The reason that this quantity is not greater for the boulder than the pebble is that
  5) both the boulder and the pebble fall at the same speed.
  6) the initial potential energies of each is the same.
  7) gravitational force acting on each is the same.
  8) the greater gravitational force on the boulder acts on a correspondingly greater mass.

[lcapri7]

Answer to Question 1

Answer: 1, 4

Answer to Question 2

Answer: 2, 8

[Engineer]

Gracias!

[triiciiaa]

Excellent