Why can't I understand simple vector questions? I've just started a higher physics and that's what we're learning. I'm stuck with this question: A kangaroo was seen to jump to a vertical height of 2.8m. How long was it in the air? I have the answer at the back of the book, but I don't know how to arrive at the answer! Please help! Do I need to split it up into the components: u - initial velocity v - final velocity a - acceleration s - distance t - time I know the equations, but when I plug the numbers in, it doesn't come out as the right answer!