# A body weighing 1 kg was thrown vertically upward at a speed of 15 m / s

A body weighing 1 kg was thrown vertically upward at a speed of 15 m / s and rose by h = 8 s. Determine the average values of the air resistance force.

To calculate the average value of the air resistance force, we use the equality: Ek = Ep + Asopr and m * V ^ 2/2 = m * g * h + Fcopr * h, whence we express: Fcopr = (m * V ^ 2/2 – m * g * h) / h.

Variables: m – body weight (m = 1 kg); V – throw speed (V = 15 m / s); g – acceleration due to gravity (g ≈ 10 m / s2); h – lifting height (h = 8 m).

Calculation: Fcopr = (m * V ^ 2/2 – m * g * h) / h = (1 * 15 ^ 2/2 – 1 * 10 * 8) / 8 ≈ 4.1 N.

Answer: The average air resistance force is 4.1 N.

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