Question

A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 metre above the ground. calculate the work done on the luggage.



hi friends

I wanted to ask if we have to take the magnitude of g as 9.8 or 10

Answer 1

As per your question, I am solving this question with two values of 'g' i.e. 9.8 m/s^2 and 10 m/s^2.

In first case:-
Mass (m) = 15 kg
Acceleration due to Gravity (g) = 10 m/s^2
Height (h) = 1.5 m

Work = mgh
=> W = (15 x 10 x 1.5) Joules
=> W = 225 Joules

Now In second case,

Mass (m) = 15 kg
Acceleration due to Gravity (g) = 9.8 m/s^2
Height (h) = 1.5 m

Work = mgh
=> W = (15 x 9.8 x 1.5) Joules
=> W = 220.5 Joules


Be Brainly

Answer 2

Answer:

The work done by porter on the luggage​ is 225 J

Explanation:

Given,

A porter lifts a luggage of mass = 15 kg from the ground.

It's on his head 1.5 m above the ground.

To find: The work done by him on the luggage​

Solution:

here, Force is due to the weight of the luggage.

i.e F = mg , where m = mass of luggage and g = accerleration due to gravity

or, F = 15 * 10 = 150 N

Work done can be given as:

W = F * s

where, F = force and s = displacement i.e 1.5 m

W = 150 * 1.5 = 225 J

Therefore, The work done by porter on the luggage​ is 225 J.