Given vector u with components one comma three , vector v with components two comma one , and cosine of theta is equal to the fraction with numerator square root of 2 and denominator 2 , where theta is the angle between the vectors, what is the scalar projection u sub v and the dot product u times v ?
Answer
A
u sub v is equal to 2 point 2 4 and times u times v is equal to 7 point 0 7
B
u sub v is equal to 1 point 4 1 and u times v is equal to 4 point 4 7
C
u sub v is equal to 7 point 0 7 and times u times v is equal to 15 point 8 1
D
u sub v is equal to 2 point 2 4 and times u times v is equal to 5 point 0 0