A student is given two rectangular "Mystery Blocks" of different size, dimensions, and mass. She is asked to determine which block has a greater mass without using a balance or scale. Which of the following procedures could determine which block has more mass? Drop both blocks from the same height and see which one hits the ground first.
Apply an equal amount of force to both blocks and see which has less acceleration.
Determine which block has greater volume by multiplying height x width x length.
Launch both blocks upward with equal speeds and see which block has a lower peak.

d. learned preferences i believe is your answer

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 the claims meet official rules.

don't misinterpret the claims

the doppler effect is used by weather forecasters to measure 

moving clouds