Let us consider two vectors A and B.
As per the question, the two vectors are perpendicular to each other.
Hence the angle between them 
We are asked to calculate the resultant of these two vectors.
As per parallelogram law of vector addition, the resultant of two vectors are-

[cos90=0]

This is the way by which we can add two perpendicular vectors.
2,450 Joules, kinetic energy is 1/2 mass x velocity squared.
Answer:
Technician A and Technician B are correct.
Explanation: