We are given with an angle 60° with v = (6, 8)
Then x^2+y^2=1
Also a.v=a v cos60
a.v=1*10*0,5=5
Since a.v=6x+8y ,so
6x+8y=5 (2)
The equations are
x^2+y^2=1 and 6x+8y=5
We substitute 2 to 1, x^2 + [(5-6x)/8]^2 = 1
x then is equal to 0.9928 and y is equal to 0.12