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5.Work, Energy, Power and Collision
easy
Two bodies of masses m and $2m$ have same momentum. Their respective kinetic energies ${E_1}$ and ${E_2}$ are in the ratio
A
$1:2$
B
$2:1$
C
$1:\sqrt 2 $
D
$1:4$
Solution
(b)$E = \frac{{{P^2}}}{{2m}}.$ If momentum are same then $E \propto \frac{1}{m}$
$\frac{{{E_1}}}{{{E_2}}} = \frac{{{m_2}}}{{{m_1}}} = \frac{{2m}}{m} = \frac{2}{1}$
Standard 11
Physics
