Jumping doesn't only consist of going up and down it also has physics in it to. when you jump you have a vertical velocity and when you reach the max distance that you can jump, you stop for a split second then you come back down to earth. your acceleration going up is always -9.18m/s^2 and coming down it is 9.81m/s^2. this is due to gravity trying to pull you back down to the earth. Say you jump off a cliff, you could find anything out if you know three of five of the kinematic variables. Say the height of the cliff was 80 meters and it took you 6 secs to fall, knowing your acceleration being 9.81 due to gravity you could figure out how far you landed from the cliff!