A 5.0 kg mass with an initial velocity of 4.0 m/s in the +x direction collides with a 4.0 kg mass with an initial velocity of 3.0 m/s in the x direction. After the collision, the 5.0 kg mass has a velocity of 1.2 m/s in the +x direction. What is the magnitude of the velocity of the 4.0 kg mass after the collision? (Hint: momentum is conserved, but energy is not.)

their crystal patterns have been disrupted by stress

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

answera compound;