Question

A container with a mass of 5kg is lifted to a height of 8m. How much work is done by the graviatational force 400 j or - 400 j or zero or 40 j

Answer 1

-400J

Explanation:

According to work energy principle.

Work done= change in energy

hence

W= mgh

putting values,

W=5×10×(-8)

W= -400J.

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Answer 2

Given:

Mass of container=5kg

Height=8m

To find:

The work done by the gravitational force

Solution:

The work done by the gravitational force is -400J.

We can find the work by following the given steps-

We know that the work done is the product of the mass of the object, the height to which it is lifted and the gravitational force.

We know that g=10m/$s^{2}$

Work done=mass×height×gravitational force

The object is being lifted upwards and so the value of g will be taken as negative.

We are given that the mass of the object is 5kg and it is lifted up to a height of 8m.

We will put the given values in the above formula.

So, on putting the values,

Work done=5×8×(-10)

Work done=40(-10)

Work done= -400J

Therefore, the work done by the gravitational force is -400J.