Consult interactive solution 7.10 for a review of problem-solving skills that are involved in this problem. a stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. the incident water stream has a velocity of +16.0 m/s, while the exiting water stream has a velocity of -16.0 m/s. the mass of water per second that strikes the blade is 50.0 kg/s. find the magnitude of the average force exerted on the water by the blade.

object 2 because all the other ones are wrong

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.