hi guys im a college junior...taking physics for the first time in my life...its fun...but still tuff...just can i get help with these couple questions..i mean it would be very gracious of any of u to help me out...i know im new and all, but this place...i was just browsing around and it rocked sooo....and wow i never new this place existed....i might come here much more often question 1: a 3.0 kg body is initially moving northward at 15m/s. Then a force of 15N, towards the east acts on it for 4.0 s (a) At the end of the 4.0 s, whats the body's final velocity? (b) what is the change in momentum during the 4.0 s? i know the answers...can you just show me how to work out part A??? i know b is 60 but i keep getting 25 for part a which is not right i would really appreciate this...thank you...illpost the other 3 questions as well ?