Which of the following are true about mass? check all that apply

a) mass changes as distance from the center of the planet changes.
b) mass determines how much an object will accelerate in response to an applied force.
c) mass changes in response to buoyant forces.
d) the size of gravitational forces depends on mass.

Gravity is pulling an object into the sun. the closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. a line graph plotting the speed of the object against time would have which shape? a: straight line of positive slope b: curved line that slopes upward c: curved line that slopes downward d: straight line of negative slope