Hi all. I had grade 11 physics so I know the basics on physics.. grade 12 comes later this year... Anyways I was thinking about the systems in a jump, and the motion involved and I know motion physics work and all so don't get me wrong :P I'm not trying to disporve something here... I just know that I'm missing something in my thought of the systems in jump. Here's the situation I have theorized and the systems involved: Someone jumps up with a strong push from their "super" legs... That extra force from their legs gives them a high acceleration until the point that their feet leave the ground... at this point, they have to begin "decellerating" (I know.. acceleration in the negative direction) but they are decelerating from a high speed that their theoretical super legs gave them.. This will take some time, so that person reaches a "super jump" height of say 5 feet... Now, that person has the acceleration of gravity speeding them up for a distance of 5 feet... In my thought, I cannot see where gravity alone can make up the speed that the super legs gave the jumper. I mean, if gravity is constantly accelerating a person negatively, then I would think the jumper would go be going up faster (time-wise) than they fall down, so the sides (going up, vs going down) wouldn't be even... This cannot possibly happen though, right? Does anyone here see what I mean or am I not making any sense :P haha. I know I have typed a lot but I hope I made sense. Thanks in advance.