Question

In loading a truck, a man lifts boxes of 100 N each though a height of 1.5mii. How much energy is transferred when one box is lifted?

Answer 1

Answer:

Potential energy = mgh = 10 * 1.5 * 10 = 150J

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Answer 2

$\Huge{\underline{\underline{\red{\sf{Question :}}}}}$

In loading a truck, a man lifts boxes of 100 N each though a height of 1.5 m. How much energy is transferred when one box is lifted ?

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$\Huge{\underline{\underline{\red{\sf{Answer :}}}}}$

Given :

• Weight of box (W) = 100 N

• Height (h) = 1.5 m

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Solution :

Use formula for Potential Energy :

$\large {\underline{\boxed{\sf{P.E \: = \: mgh}}}}$

We are given,

Weight of box = mass of box * g

So,

✪ P.E = W*h

Put Values

⇒P.E = (100)(1.5)

⇒P.E = 150 J

$\Large {\boxed{\sf{Potential \: Energy \: = \: 150 \: J}}}$

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Additional Information :

• Potential energy is in when the object is in state of rest .
• S.I unit of Energy is Joule .
• Formula for energy is Work Done/ Time Taken.
• There is one more type of energy Kinetic Energy.
• Formula for Kinetic Energy is 1/2 mv².
• An object have this energy in state of motion .
• Work done formula is Force * Displacement