A parachutist is falling towards the ground at a constant speed $v$. The rate at which she is losing gravitational potential energy is $R$.
The acceleration of free fall is $g$.
What is the mass of the parachutist?
1 )
$\frac{gv}{R}$
$\frac{R}{gv}$
3 )
$\frac{2R}{v^2}$
4 )
$\frac{v^2}{2R}$
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