vectors...plz solve this?

Question

a particle travels with speed 50m/s from the point (3,-7) in a direction 7i-24j. find its position vector after 3sec.

Answer 1

(7^2 + 24^2)^(1/2) = 25
50/25 = 2
3*2 = 6
6*7 = 42
6*24 = 144
3 + 42 = 45
- 7 + 144 = 137
(i,j) = (45,137)

Answer 2

You should learn how to do your own homework, or ask specific questions after you've already tried working the problem for awhile. Don't just ask "solve this".