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Two objects collide in a totally inelastic collision. Just before the collision, the objects have the...

Two objects collide in a totally inelastic collision. Just before the collision,
the objects have the following masses and velocities:
M1 = 4.5 kg, v1 = 1.5 m/s @ 140o. M2 = 1.5 kg, v2 = 1 m/s @ 180o.
a) Find the velocity of the object after the collision.
b) How much kinetic energy was lost in the collision.

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