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Question
An object of mass 40 kg is raised to a height of 5 m above ground. If the object is allowed to fall, find its kinetic energy when it is half-way down.
An object of mass 40 kg is raised to a height of 5 m above ground. If the object is allowed to fall, find its kinetic energy when it is half-way down.
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Solution
The correct option is B 1 KJ
As the kinetic energy gets converted to Potential energy when an object is raised to a height therefore, PE = mgh Given, m = 40 Kg, h = 5 m and g = 10 ms−2PE = 40 x 5 x 10 = 2000 JNow, Potential energy of the object when raised to half of its height will PE/2 = 2000 J/2 = 1000 JTherefore, Kinetic energy at half-way down will be 1 KJ.
As the kinetic energy gets converted to Potential energy when an object is raised to a height therefore,
PE = mgh
Given, m = 40 Kg, h = 5 m and g = 10 ms−2
PE = 40 x 5 x 10 = 2000 J
Now, Potential energy of the object when raised to half of its height will
PE/2 = 2000 J/2 = 1000 J
Therefore, Kinetic energy at half-way down will be 1 KJ.
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