(1) The Gravitational Potential Energy of the ball is 784 J.
(2) The Kinetic Energy of the dog is 10,000 J.
(3) The total Mechanical Energy of the Skydiver is 78,000 J.
(1)
The Gravitational Potential Energy of the ball is the energy possessed by the ball due to its height above the ground.
P.E = mgh
P.E = 8 x 9.8 x 10
P.E = 784 J
(2)
The Kinetic Energy of the dog is possessed by the dog due to its motion.
K.E = ¹/₂mv²
K.E = 0.5 x 50 x 20²
K.E = 10,000 J
(3)
The total Mechanical Energy of the Skydiver is the sum of the potential energy and the kinetic energy.
M.A = P.E + K.E
M.A = 78,000 J + 100,000 J
M.A = 178,000 J
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