Question

A man of mass 60 kg records his weight on a weighing machine placed inside a lift. The ratio of weights of man recorded when lift is ascending up with a uniform speed of 2 m/s to when it is descending down with a uniform speed of 4 m/s will be

(a) 0.5

(b) 1

(c) 2

(d) none of these.

Answer 1

Option (b) is correct

Explanation

Mass of man m=60kg

Weight of the man W=mg=60×10=600N

Weight of the man in the lift ascending or descending  with any uniform velocity will be same as in stationary state.ie 600N

Hence the required ratio is 1 here

Answer 2

Correct option (b) 1

Explanation :

Uniform speed will not affect his weight.