In a device called the ballistic pendulum, a compressed spring is used to launch a steel ball horizontally into a soft target hanging from a string. The ball embeds in the target and the two swing together from the string. Describe the energy transfers and$/$or transformations that take place during the use of the ballistic pendulum and at what points they occur.

B

$1$

$U_{?}$

$T^2$

$T_2$

Word$($s$)$