an object of mass 20 kg is raised to the height of 10 m above the ground. what is its potential energy? if the object is allowed to fall, find its kinetic energy when it is halfway down
Answers
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down
Mass of the object, M=40kg
Height up to which it is raised h=5 m
Potential energy P.E=Mgh
P.E=40×10×5=2000J
Let its kinetic energy be Ek when it is halfway down i.e h′=h/2
According to the conservation of energy,
K.Ei+P.Ei=K.Ef+P.Ef
0+2000=Ek+Mgh/2
∴ 2000=Ek+40×10×5/2
⟹Ek=1000J
formula same just change the numbers
Answer:
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down
Mass of the object, M=40kg
Height up to which it is raised h=5 m
Potential energy P.E=Mgh
P.E=40×10×5=2000J
Let its kinetic energy be Ek when it is halfway down i.e h′=h/2
According to the conservation of energy,
K.Ei+P.Ei=K.Ef+P.Ef
0+2000=Ek+Mgh/2
∴ 2000=Ek+40×10×5/2
⟹Ek=1000J
formula same just change the numbers
Explanation:
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