Question

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

Answer 1

Correct Answer - 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`