1. A 5 kg object is moving downward at a speed of 12 m/s. If it is currently 2.6 m above the ground… a. What is its kinetic energy? b. What is its potential energy? c. What is its mechanical energy?
Answer (1)
Formulas:Kinetic Energy (KE) = 1/2mv²Potential Energy (PE) = mghMechanical Energy (ME) = KE + PEGiven:Mass (m) = 5kgSpeed (v) = 12 m/sHeight (h) = 2.6mGravitational Acceleration (g) = 9.8 m/s²A. Kinetic Energy (KE) = 1/2 x 5 x 12² = 1/2 x 5 x 144 = 2.55 x 144 = 360 JB. Potential Energy (PE) = 5 x 9.8 x 2.6 = 49 x 2.5 = 127.4 JC.Mechanical Energy (ME) = KE + PE = 360 + 127.4 = 487.4 J
