Can someone help me with this question please, I just keep getting it wrong!In this question, i and j are the standard unit vectors in the Ox and Oy directions.An object has initial position (2i – j) m and velocity (-i 4j) ms-1It has a constant acceleration of (2i 5j) ms-2Calculate the object’s velocity and position after four seconds.
sure. I've figured out how to get v, which I used the v=u+at formula for: v=-1i+4j+4(2i+5j) which equals 7i+24j. However when I try to work out r I get 12i+56j. I put it into the r=ut+1/2at^2 formula to get this, but that's not the answer.