Question

a book is placed on a table 9 meters above the ground and has a potential energy of 60j. what is the mass of the book​

Answer 1

Required Answer :

Mass of the book = 0.68 kg

Given :

• Height = 9 metres
• Potential energy = 60 J

To find :

• Mass of the book = ?

Solution :

To calculate the mass of the book, we will use the formula of potential energy.

• PE = mgh

where,

• PE denotes potential energy
• m denotes the mass
• g denotes the acceleration due to gravity
• h denotes the height

Substituting the given values :

⇒ 60 = m × 9.8 × 9

⇒ 60 = m × 88.2

⇒ 60/88.2 = m

⇒ 0.68 = m

Therefore, mass of the book = 0.68 kg

Answer 2

★ Given:-      

• ➠ Height = 9 m
• ➠ Potential energy = 60j

★ To find:-    

• ➠ Mass of a book

★ Solution:-      

☯ On putting values:

$\qquad\tt{:\implies\:PE\:=\:mgh}$

$\qquad\tt{:\implies\:60\:=\:m\:\times\:9.8\:\times\:9}$

$\qquad\tt{:\implies\:60\:=\:m\:\times\:88.2}$

$\qquad\tt{:\implies\:m\:=\:\dfrac{88.2}{60}}$

$\qquad\tt{:\implies\:m\:=\:0.68\:kg}$

$\therefore\underline{\bf{The\:mass\:of\:a\:book\:is\:0.68\:kg\:.}}$

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