physics momentum and energy

An object of mass m1 = 18 kg and velocity v with arrow1 = 3 m/s crashes into another object of mass m2 = 13 kg and velocity v with arrow2 = -16 m/s. The two particles stick together as a result of the collision

(A) Determine the velocity v with arrowf of the objects after collision.

(B) Determine the change in total mechanical energy.

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