The friction of the air causes a vertical retarding equal to 10% of th...
Friction of Air and Time of Flight
Friction of air is a common phenomenon that affects the motion of objects in the atmosphere. The effect of air friction on the motion of a projectile is dependent on the speed, shape, and size of the object. In this question, we are given that the friction of air causes a vertical retarding equal to 10% of the acceleration due to gravity. Let's analyze how it affects the time of flight.
Effect of Air Friction on Time of Flight
The time of flight is the time taken by a projectile to reach its maximum height and return to the ground. In the absence of air friction, the time of flight is given by:
T = 2u/g
Where T is the time of flight, u is the initial velocity, and g is the acceleration due to gravity.
However, in the presence of air friction, the time of flight is expected to increase due to the retarding force of air acting against the projectile. But the question states that the time taken to return to the ground from the maximum height is almost the same as in the absence of friction. Therefore, we can conclude that the effect of air friction on the time of flight is negligible.
Explanation of Answer
Option A is the correct answer because the time of flight is almost the same as in the absence of air friction. The effect of air friction on the projectile is minimal, and it does not significantly affect the time of flight. Therefore, the time taken to return to the ground from the maximum height is almost the same as in the absence of friction.
Conclusion
In conclusion, air friction affects the motion of objects in the atmosphere, but its effect on the time of flight of a projectile is negligible. In this question, the time of flight is almost the same as in the absence of air friction. It is essential to understand the effect of air friction on the motion of objects to accurately predict their behavior in the atmosphere.
The friction of the air causes a vertical retarding equal to 10% of th...
A