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How many joules of potential energy does a 1.5kg book gain when it is elevated 2 m ? When it is elevated 4 m ? (Let g = 10 N/kg .)
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The potential energy when it is elevated 2 m and 4 m .
Answer to Problem 5PC
The potential energy when it is elevated 2 m is 30 J and for 4 m is 60 J .
Explanation of Solution
Given info: Mass of the book is 1.5kg and the elevation of the book is 2 m and 4m .
Write the expression for the potential energy.
PE = mgh
Here,
m is the mass of the book
g is the acceleration due to gravity
h is the elevation from the ground
Calculate potential energy for the elevation of .
Substitute 1.5kg for m , 2 m for h and 10 N/kg for g in the above equation to get PE .
Calculate potential energy for the elevation of 4 m .
Substitute 1.5kg for m , 4 m for h and 10 N/kg for g in the above equation to get PE .
Conclusion:
Therefore, the potential energy when it is elevated 2 m is 30 J and for 4 m is 60 J .
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Conceptual Physical Science Explorations
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