Aglider airplane is coasting horizontally when a very heavy object suddenly falls out of it. as a result of dropping this object and assuming there is no air resistance, a) the glider’s speed will first increase, then decrease. b) the glider’s speed will first decrease, then increase. c) the glider’s speed will increase. d) the glider’s speed will decrease. e) the glider’s speed will remain the same as it was.

To solve the problem it is simply necessary to apply the concepts related to the kinematic equations of motion and Newton's second law.

Newton states that Force is proportional to mass and acceleration, so

We know that in the absence of air resistance, in a sum of forces on the Glider there would be no horizontal component. In this way there would only be two forces, the lifting force and the force caused by the total weight of the Glider. By decreasing the weight the variation that would exist is clearly in its vertical stability. As regards speed or acceleration, they will remain the same. Recall that the acceleration is the change of speed, and in the absence of a force that modifies this in the horizontal component, then the balance will remain there and the speed will remain constant. There is no force that generates a change in its horizontal component and that can affect drag or thrust.

The correct answer is, E) The glider's speed will remain the same as it was

it about 600 mph from what i calculated

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.