Question

A coolie with a suitcase on his head is climbing up on a ladder with uniform speed. Explain the work done by the coolie on the suitcase.

Answer 1

The work done by the coolie on the suitcase is ZERO

Coolie is not doing work because we know that, Work Done= Force × Displacement.

Work Done = FxSxCosФ

Here, coolie climbs in the vertical direction making an angle of 90°.

Hence, Work Done = FxSxCos90°

⇒ Work Done = 0 (Zero)

Answer 2

negative

Explanation:

negative , because lader does not in. the 90° angle , of lader is 90° angle then how the coolie climd

so the answer is negative