A10-m-long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 34 m/s when a 60 kg skydiver drops out by releasing his grip on the glider. what is the gliders speed just after the skydiver lets go? express your answer to two significant figures and include the appropriate units.

34 m/s

Explanation:

m = Mass of glider with person = 680 kg

v = Velocity of glider with person = 34 m/s

= Mass of glider without person = 680-60 kg

= Gliders speed just after the skydiver lets go

= Mass of person = 60 kg

= Velcotiy of person = 34 m/s

As the linear momentum of the system is conserved

The gliders speed just after the skydiver lets go is 34 m/s

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.