First slide

Work

Question

A man is waiting at a bus stop by holding a box on his head. Work done by him is

Moderate

A

Zero
B

positive
C

negative
D

Infinity

Solution

$w o r k d o n e W = F . S \cos θ w h e r e F = f o r c e; S = d i s p l a c e m e n t; θ i s a n g l e b e t w e e n f o r c e a n d d i s p l a c e m e n t g i v e n S = 0 ∴ W o r k d o n e = 0$

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