A $2\mathrm{.}5$ kg mass has an initial velocity $1\frac{m}{s}$ to the right. A $10$ kg mass has an initial velocity $10\frac{m}{s}$ to the right. The two collide inelastically. After the collision, the masses move together as one unit.

Part A

What must the orientation be for this collision to occur

A collision will always occur

The $2\mathrm{.}5$ kg mass must be behind the $10$ kg mass.

The $10$ kg mass must be behind the $2\mathrm{.}5$ kg mass.

$$ Request Answer

Part B

What is the final velocity $v_f$ of the system after the collision?

$$