What is the total mechanical energy of a body weighing 1.2 kg if at a height of 1.2 m it has a speed of 45 m / s?

To determine the value of the total mechanical energy of the specified body, it is necessary to use the formula: Emech = Ek + Ep = mt * V ^ 2/2 + mt * g * h.

Constants and variables: mt – mass (mt = 1.2 kg); V is the speed of the specified body (V = 45 m / s); g – acceleration due to gravity (g ≈ 10 m / s2); h – height (h = 1.2 m).

Calculation: Emech = mt * V ^ 2/2 + mt * g * h = 1.2 * 45 ^ 2/2 + 1.2 * 10 * 1.2 = 1229.4 J.

Answer: The total mechanical energy of the specified body is 1229.4 J.