PLEASE HELP The mass of the earth is 81 times the mass of the moon. Using Newton's Law of Gravity what would the affect of gravitation be if the mass of the moon were
doubled and the distance was also doubled?

a. twice the gravitational attraction

b. 4 times the gravitational attraction

c. half the gravitational attraction

d. 1/4 the gravitational attraction

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.