Question

A hammer of mass 3 kg is raised to a height of 5 m. What will be its potential energy? (g = 9.8 m/ s2)




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Answer 1

Given :

Mass of the hammer = 3 kg

Height = 5m

Gravitational force = 9.8m/s²

To find :

The potential energy of the hammer.

Solution :

Potential energy is energy due to position.

• Potential energy is scalar quantity having magnitude.
• Sl unit of P.E is Joules.
• CGS unit of P.E is erg.

Potential energy of an object is given by

P.E = mgh

where,

• P.E denotes potential energy.
• m denotes mass.
• g denotes gravitational field.
• h denotes height.

Substituting all the given values in the formula,

$\leadsto \sf P.E = mgh$

$\leadsto \sf P.E = (3)(5)(9.8)$

$\leadsto \sf P.E =147 \: J$

thus, the potential energy of the hammer is 147J.

Remember !

SI unit of potential energy is Joules (J).

Answer 2

$\huge\underline{\bf \red{ ❥ ᴀɴsᴡᴇʀ }}$

• According to the question :

=> P.E= mgh

=> P.E= (3)(5)(9.8)

=> P.E= 147Joule. Ans.