A body weighing 3 kg moves at a speed of 72 km / h at an altitude of 15 m above the ground

A body weighing 3 kg moves at a speed of 72 km / h at an altitude of 15 m above the ground. determine its total mechanical energy.

To calculate the total mechanical energy of the body in question, we will use the formula: E = Ep + Ek = m * g * h + m * V ^ 2/2 = (g * h + V ^ 2/2) * m.

Variables and constants: g – gravitational acceleration (g ≈ 10 m / s2); h – height above the ground (h = 15 m); V – speed of movement (V = 72 km / h = 20 m / s); m – body weight (m = 3 kg).

Calculation: E = (g * h + V ^ 2/2) * m = (10 * 15 + 20 ^ 2/2) * 3 = 1.05 * 10 ^ 3 J = 1.05 kJ.

Answer: The total mechanical energy is 1.05 kJ