A ball is falling from 600 meters. Find out the potential energy at 400 meters and also find out the kinetic energy when the ball was travelling half of the height and the mass of the ball is 20 kg
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Answer:
Potential at 400m = 80 kJ
Kinetic at 300m = 60 kJ
Explanation:
1)
Potential Energy = m×g×h = 20×10×400
= 80000J = 80 kJ
2)
Total Energy = Kinetic Energy + Potential Energy
At 600m,
Potential Energy = m×g×h= 120000
Speed = 0 (*falling from 600m)
Kinetic Energy= ½m×v² = 0
Total Energy = 120000 + 0 = 120000J
At half height, 300m,
Total Energy = 12000J
Kinetic = 120000 - 20×10×300 [*Total- mgh]
= 12000-60000 = 60000 J = 60 kJ
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