Question

A boy of weight 60 kg wt is standing in a lift. If the lift begins to move up with a uniform speed 4.9 m/s, the apparent weight of boy is
1)60 kg wt
2)90 kg wt
3)30 kg wt
4) zero

Answer 1

Please, take note of the above information and remember that.

Answer 2

Given:

A boy of weight 60 kg wt is standing in a lift. If the lift begins to move up with a uniform speed 4.9 m/s.

To find:

Apparent weight of the boy?

Calculation:

• As per the question, the weight of boy = 60 kgwt with respect to a stationary lift.

Now, the lift moves upwards with a uniform speed of 4.9 m/s.

• That means the boy doesn't experience any additional acceleration of the lift.

• In other words, does not experience any pseudo-force.

• Apparent weight = 0 + 60 = 60 kgwt.

Hence, his apparent weight will remain same as 60 kgwt.