A spring is placed horizontally on a frictionless table. The spring constant of the spring is 50 N/m, and it is compressed 0.100 m by a 2.00 kg block. [a.] How much energy is stored in the spring?[b.] When the spring expands back to its resting position, it pushes the block away. What is the kinetic energy of the block as a result of this force?[c]. What is the velocity of the block as it is pushed away by the spring? *

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.

that would be because of both gravity and friction. so     c

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.