A TV tower is 40m high. A mass of 5kg is dropped from its top. Calculate the potential energy at the top and kinetic energy just before it hits the ground.
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Answer:
The Potential Energy at the top : 2000 J
The Kinetic Energy just before it hits the ground : 2000 J
Explanation:
At the top of the tower, just after dropping, the PE of the body will be maximum and KE will be 0, ie ;
Total Energy : PE + KE
: mgh + 0
: 5 (10) (40)
: 2000 J
: 2 kJ
Now, just before it hits the ground, the KE of the body will be maximum and the PE will be zero.
Total Energy : PE + KE
2000 J : 0 + KE ( According to Law of Conservation of Energy)
⇒ KE = 2000 J
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