Which two quantities can be used to describe motion? A: Displacement and weight. B: speed and acceleration. C: speed and mass. D: Velocity and mass.​

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?