if an object is thrown straight up and air resistance is negligible, then it\'s
ID: 1327829 • Letter: I
Question
if an object is thrown straight up and air resistance is negligible, then it's speed when it returns to the starting point is the same as when it was released. if air resistance were not negligible, how would its speed upon return compare with its initial speed and how would maximum height to which it rises be affected? Explain answer in terms of forces and kinematics if an object is thrown straight up and air resistance is negligible, then it's speed when it returns to the starting point is the same as when it was released. if air resistance were not negligible, how would its speed upon return compare with its initial speed and how would maximum height to which it rises be affected? Explain answer in terms of forces and kinematics if an object is thrown straight up and air resistance is negligible, then it's speed when it returns to the starting point is the same as when it was released. if air resistance were not negligible, how would its speed upon return compare with its initial speed and how would maximum height to which it rises be affected? Explain answer in terms of forces and kinematicsExplanation / Answer
When the air resistance is negligible the conservation of energy takes place that the kinetic energy get completely converte into the potential energy of the object
(1/2)mV2 = mgh
Hence when object returns to the inital position again the complete potential energy get converted to the kinetic energy.
But when air resistance is considered the force due to the air drag comes into act
say FD is the drag force
initial energy = Kinetic energy
Final energy = potential energy
but in this case some work is lost due to the work done in against of air drag
therefore object rises through height say H
work done against drag = FD*H
(1/2)mV2 = mgH + FDH
so in this case the height raised by the object will be less than the previous case.
Similarly when object falls down to its initial position once agin it has to do work against air drag.
Therefore its potential energy which is less than initial kinetic energy alos not get converted completely into the kinetic energy therfore the velocity will be not same as what it was.
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