In kinetic theory of gases, a molecule of mass m of an ideal gas collides with a wall of vessel with velocity $V.$ The change in the linear momentum of the molecule is
A$2mV$
B$mV$
C$-mV$
D
Zero
AIIMS 1997, Medium
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A$2mV$
a $\Delta p = mV - ( - mV) = 2mV$
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