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A solid sphere falls with a terminal vel...

A solid sphere falls with a terminal velocity of `10 m//s` in air. If it is allowed to fall in vacuum.

A

terminal velocity will be more than `10 m//s`

B

terminal velocity will be less then `10 m//s`

C

terminal velocity will be `10 m//s`

D

there will be no terminal velocity

Text Solution

Verified by Experts

The correct Answer is:
A
loss in `PE = Mgl`
Elastic `PE = (1)/(2)Kx^(2)`
`= (1)/(2)(Mg)/(A) xx (l)/(L) xx AL`
`MgL//2`
Heat `= MgL - Mg L/2`
`= Mg L//2`
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