A small sphere of mass m is dropped from a height After it has fallen 100 m it has attained its terminal velocity and continues to fall at that speed.

Question

A small sphere of mass m is dropped from a height After it has fallen 100 m it has attained its terminal velocity and continues to fall at that speed.

A small sphere of mass m is dropped from a height After it has fallen 100 m it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is-
A. Greater than the work done by air friction in the second `100 m`
B. Less than the work done by air friction in the second `100 m`
C. Equal to `100 mg`
D. Greater than `100 mg`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
In the first `100m` body starts from rest and its velocity goes on increasing and after `100m` it acquire maximum velocity (terminal velocity). Further, air friction i.e viscous force which is proportional to velocity is low in the beginning and maximum at `v=v_(T)`.

4 views Answered 2023-02-05 15:29