Question

a boy does a work of 800 joule is dragging a sack of rice through a distance of 10 metre what is the magnitude force applied by the boy.

Answer 1

Answer:

80 N is the answer.

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Explanation:

refer to the attachment.

Answer 2

Answer :

➥ The magnitude force applied by the boy = 80 N

Given :

➤ Work done by boy (w) = 800 j

➤ Displacement travelled by boy (s) = 10 m

To Find :

➤ Magnitude of force applied by the boy = ?

Solution :

Work done is a scalar quantity represented by the product of force and the distance for which the object has been moved.

Work represents the energy expended by the force in order to move the object.

Work , being a scalar doesn't have any direction, just has magnitude.

$\tt{: \implies Work = Force \times Displacement}$

$\tt{:\implies Force = \dfrac{Work}{Displacement}}$

$\tt{:\implies Force = \dfrac{80 \cancel{0}}{1 \cancel{0}}}$

$\tt{:\implies Force = \dfrac{80}{1}}$

$\tt{:\implies \green{ \underline{ \overline{ \boxed{ \purple{ \bf{ \: \: Force = 80 \: N \: \: }}}}}}}$

Hence, the magnitude force applied by the boy is 80 N.

$\:\:\:\:\:\:\:$

Some related formulae :

⪼ $\sf{Work = Force \times Displacement}$

⪼ $\sf{Force = \dfrac{Work}{Displacement}}$