Answer :
23 km when x1+ x2 = 0.87/10. is the main answer.
The size of a vector in the x-direction is expressed by its x-component, also known as its horizontal component. The size of a vector in the y-direction is represented by its y-component, also known as its vertical component. A projectile's trajectory is determined by velocity in two dimensions. The projectile's x and y components each represent its horizontal and vertical motion, respectively. Meters are the units used to indicate both horizontal and vertical distances (m).
A+B=A= (x1+x 2) i+20 jx1+x2/20
=tan60 = 0.5/0.87.
A=x1 i+10 j.
B=x2 i+10 j.
A+ B = (.87/10) 2 + 20 /2
= 23 km when x1+ x2 = 0.87/10.
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