Question

31. A truck travelling due north at 20 m/s turns west and travels
at the same speed. The change in its velocity be
(a) 40 m/s N-W
(b) 20√2 m/s N-W
(c) 40 m/s S-W . (d) 20√2 m/s S-W
​

Answer 1

change in velocity is final-initial velocity

Vi=20j cap

Vf=20(-î)

so change in velocity is -20î - 20j

if magnitude is askd since î and j are perpendicular to each other so magnitude of chnage in velocity is

under root>>20^2+20^2=20under root2

hope u understud!!