Question

A man of mass 68 kg is in a lift of his office. The lift starts to accelerate upwards. What could be the
possible weight the man would feel now?​

Answer 1

Answer:

zero.because weight can be zero changing the place and position

Answer 2

The man will feel less weight than its original weight.

Explanation:

Given that,

Mass of man = 68 kg

Suppose the acceleration is 0.4 m/s².

We need to calculate the normal force

Using formula of force

$F=mg$

$F=68\times9.8$

$F=666.4\ N$

If the lift at rest then the man will feel 666.4 N force.

When the lift starts to accelerate upward then the force will be

Using balance equation

$F' =F-ma$

$F'=666.4-68\times0.4$  

$F'=639.2\ N$

Hence, The man will feel less weight than its original weight.

Learn more :

Topic : newton second law

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