Question

pls answer this fast.........

Answer 1

A vector=20sin45j^ -20cos45i^
B vector=15sin45j^+15cos45i^

V B respect to A= 15cos45i^+15sin45j^
- 20sin45j^+20cos45i^
=-1(5sin45i^+5sin45j^)
=-1 (5/root2 i^+5/root2j^)
magnitude v= root of(25/2+25/2)
=root of(50/2)
=root of(25)
=5m/s
$\sqrt{2}$