Mon March 09, 2015 By: Nileshpatel19752000 Patel

An object of mass 50kg is raised to a hight of 10m above the ground. Find the potential
energy of the object at the higest point. If the object is allowed to fall freely, what is its kinetic energy when it is half way down? give reason to justify your answer.(g=10m/s)

Expert Reply
Yashvanti Jain
Mon March 09, 2015

Gravitational potential energy is given by the expression,

W = m g h


h = Height above the ground = 10 m

m = Mass of the object = 50 kg

g = Acceleration due to gravity = 10 ms-2

W = 50 × 10 × 10 = 5000 J.

At half-way down, the potential energy of the object will be, begin mathsize 12px style 5000 over 2 space equals space 2500 space straight J end style  

At this point, the object has an equal amount of potential and kinetic energy. This is due to the law of conservation of energy. Hence, half-way down, the kinetic energy of the object will also be 2500 J.


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