A mass $m$ moving horizontally with velocity $v_0$ strikes a pendulum of mass $m$. If the two masses stick together after the collision, then the maximum height reached by the pendulum is
A mass $m$ moving horizontally with velocity $v_0$ strikes a pendulum of mass $m$. If the two masses stick together after the collision, then the maximum height reached by the pendulum is
- A
$v_0^2/8g$
- B
$v_0^2/2g$
- C
$\sqrt {2{v_0}g} $
- D
$\sqrt {{v_0}g} $
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