Question

Saloni stands still for a few minutes with heavy load of 15 kg on her head 1.5 metre above the ground. Calculate the work done by her.
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Answer 1

Answer:

Hence, the work done by Saloni = 225 Joules

Explanation:

The formula for work, as we know, is Work = Mass x Gravity x Height.

Here, the mass of the luggage is 15 kg, the constant of gravity is 10 m/s^2, and the height is 1.5 m.

Therefore, the total amount of work done can be calculated by multiplying these three values, that is,

Work= 15 x 10 x 1.5 = 225 Joules.

Hence, the work done by Saloni = 225 Joules

Answer 2

Solution:

It is given that, Saloni stands still for a few minutes with heavy load of 15 kg on her head 1.5 m above the ground.

We've to calculate work done by her.

Here, work done = potential energy [ Because the girl is in rest ]

So, formula used will be :

$\large{\boxed{\sf{Work\:done\:=\:mgh}}}$

$\bold{Here}$ $\begin{cases}\sf{m\:is\:mass\:of\:object,m=15\:kg}\\\sf{g\:is\:accelaration\:due\:to\:gravity,g=9.8\:m/s^{2}}\\\sf{h\:is\:height,h=1.5\:m}\end{cases}$

Putting the values,

$\implies$ Work done = 15 × 9.8 × 1.5

$\implies$ Work done = 220.5 J

Hence, work done by her is 220.5 J.