Question

A 2kg book falls off the top of a
2.3 m bookshelf. What is its
potential energy right before it
falls?
O A 450.8 J
O B. 2.94 J
OC. 0.47 J
O D. 45.08 J​

Answer 1

Answer:

option A is correct

Explanation:

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Answer 2

The potential stored in the object, of mass 'm', present at a height 'h' is given by mgh where 'g' is acceleration due to gravity.

In the given question

The mass of the book 'm' =2 kg

The height at which the book is present 'h' = 2.3 m

The acceleration due to gravity = 9.8 m/s²

Hence, the potential energy stored in the object is given :

P.E. =mgh

      = 2*2.3*9.8

     = 45.08 J

Hence, the potential energy of the book before the fall is 45.08 J.