The stone is thrown vertically upward, at a speed of 20 km / h, its mass is 240 grams. Find kinetic energy.

To find out the kinetic energy of the presented stone at the moment of throwing, consider the formula: Ek = 0.5 * mk * V ^ 2, where mk is the mass of the presented stone (mk = 240 g = 0.24 kg); V – throwing speed (V = 20 km / h = 5.5 (5) m / s).

Let’s perform the calculation: Ek = 0.5 * mk * V ^ 2 = 0.5 * 0.24 * 5.5 (5) ^ 2 ≈ 3.7 J.

Answer: The kinetic energy of the presented stone at the time of the throw was 3.7 J.