A $5\mathrm{.}00$ kg boulder dropped from a $12\mathrm{.}0$ m high tower strikes the ground with momentum:

$60$ kg$*\frac{{?}^{**}}{s}$

$76\mathrm{.}7$ kg$*$

$120$ ks

A $0\mathrm{.}20$ kg ball and a $0\mathrm{.}40$ kg ball approach from opposite directions. Initially, the $0\mathrm{.}20$ kg ball is moving at $3\mathrm{.}0\frac{m}{s}$ to the right and the $0\mathrm{.}40$ kg ball at $2\mathrm{.}0\frac{m}{s}$ to the left. After a collision, the $0\mathrm{.}20$ kg ball is moving $3\mathrm{.}0\frac{m}{s}$ to the left and the $0\mathrm{.}40$ kg ball is:

moving $1\mathrm{.}5\frac{m}{s}$ to the right

moving $1\mathrm{.}0\frac{m}{s}$ to the left

moving $1\mathrm{.}0\frac{m}{s}$ to the right

at rest