Question $7$

$1$ pts

A $6\mathrm{.}0-kg$ object moving $5\mathrm{.}0\frac{m}{s}$ collides with and sticks to a $4\mathrm{.}0-kg$ object that is at rest. After the collision, what will be the velocity of the composite object?

$3\frac{m}{s}$

$4\mathrm{.}5\frac{m}{s}$

$7\mathrm{.}5\frac{m}{s}$

$6\frac{m}{s}$

$5\frac{m}{s}$

Question $8$

$1$ pts

A $3\mathrm{.}0-kg$ object moving in the positive $x$ direction has a one$-$dimensional elastic collision with a $5\mathrm{.}0-$kg object that is initially at rest. After the collision the $5\mathrm{.}0-kg$ object has a velocity of $6\mathrm{.}0\frac{m}{s}$ in the positive $x$ direction. What was the initial speed of the $3\mathrm{.}0$ kg object?

$4\mathrm{.}5\frac{m}{s}$

$6\mathrm{.}0\frac{m}{s}$

$8\mathrm{.}0\frac{m}{s}$

$5\mathrm{.}5\frac{m}{s}$

$7\mathrm{.}0\frac{m}{s}$