Forces cause objects to A. have inertia.
B. move at a constant velocity.
C. accelerate.
D. do all of the above.
I am unsure whether it is A because forces countering one another creates inertia and mass has to do with velocity and acceleration. So I am unsure whether or not it is A or D please help

Modify the equation fδt=δ (mv) to find the force of friction.

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.