Question

A body was thrown vertically upwards with an initial velocity of 30 m/sec and attained its maximum height in 2.5 sec. What was the mean value of the force of resistance of air acting on the body during its upward motion? The mass of the body is 40 g.  

Answer 1

Answer:

Explanation:

The equation for Newton's second law, while the body is travelling upward, will have the form mg + F = ma, where F is the mean value of the air resistance. From the equations of motion for uniform deceleration to a final velocity of zero it follows that a = V₀/t₁. Hence

Actually, the air resistance is not constant, and, at small velocities, it is proportional to the velocity of the body. At large velocities, it increases proportionally to a higher power of the velocity.