Question

A man carrying a suitcase in hand the the wok done is zero??

Answer 1

Question

A man carrying a suitcase in hand has a work done of zero. Why?

Answer

★Apparently,the man is at rest. Any object at rest has a velocity of zero.

• Implies,Displacement of the object also should be zero

Now,

Work Done is a product of force and displacement » W = F.s

Thus, W = 0J

In other words,any stationary object has zero work done

Answer 2

$\huge{\underline{\underline{..........Answer.........}}}$

$\huge{\underline{Given:-}}$

☆A man carrying a suitcase in hand .

$\huge{\underline{Explanation:-}}$

☆As the man is standing the displacement covered by him is zero.

From,work done formula.

$\huge{\boxed{\boxed{W = F.s}}}$

☆Now, displacement is zero.

it becomes,

${W = F \times 0}$

$\huge{\boxed{\boxed{W = 0 }}}$

☆So, the man carrying suitcase in hand work done is Zero.

Note:-

Even the angle made by the suitcase is 90° and cos90°is zero which also makes work done Zero.