Question

A man weighing 60kg is ascending a ladder 10 m making along an angle 30 work done by him againist gravity

Answer 1

Answer:

Explanation:

Correct Question :-

A man weighing 60 kg is ascending a ladder 10 m long making an angle 30° with the horizontal. Calculate the work done by him against gravity.

Answer :-

Solution :-

Given :-

Mass, m = 60 kg

Angle made by the ladder with the vertical

= 90° - 30° = 60°

Length of the ladder, d = 10 m

To Calculate :-

Work Done, W = ??

Formula to be used :-

W = mgh

But h = vertical distance moved by the man

= d cos ∅

= 10 × cos ∅

= 10 × 1/2

= 5.0 m

From W = mgh, we get

W = 60 × 9.8 × 5

W = 2940 J

Hence, the work done by him against gravity is  2940 J.

Answer 2

Refer the attachment................