- Home
- Standard 11
- Physics
5.Work, Energy, Power and Collision
normal
A body is dropped from a height $h$ . If it acquires a momentum $p$ just before striking the ground, then the mass of the body is
A
$\frac{p}{{\sqrt {2gh} }}$
B
$\frac{{{p^2}}}{{2gh}}$
C
$\frac{{2gh}}{p}$
D
$\sqrt {\frac{{2gh}}{p}} $
Solution
Kinetic energy acquired by the body after falling through a height, $\mathrm{h}=$ loss of gravitational potential energy $=\mathrm{mgh}$
$O r$ $\frac{\mathrm{p}^{2}}{2 \mathrm{m}}=\mathrm{mgh} \quad \text { or } \quad \mathrm{m}=\frac{\mathrm{p}}{\sqrt{2 \mathrm{gh}}}$
Standard 11
Physics
