A75.0 kg stunt man jumps from a balcony and falls 24.0
mbefore colliding with a pile of mattresses. if the mattresses
arecompressed 1.15 m before he is brought to rest, what is the
averageforce exerted by the mattresses on
thestuntman?

The force that acts on the man equals 15354.75 newtons.

Explanation:

After falling through a distance of 24.0 meters the speed of the stunt man upon hitting the mattress can be obtained using third equation of kinematics as

( u=0 since the man falls from rest)

Now since the man is decelerated through a distance of 1.15 meters thus the acceleration produced can be obtained from third equation of kinematics as

Now by newton's second law the force that produced deceleration of the calculated magnitude is obtained as

The negative sign indicates that the direction of force is opposite of motion.

real, smaller and upside-down.   so the answer should be b.

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.