hello, glad this site exisits. i got a test coming up on work, power, k and p energy, so forth . . . i got two test problems here that i can't figure out for the life of me. a) While running a person dissapates .6 j of mechanical energy per kg of body mass. if a 60 kg runner dissapates a power of 70 W during a race, how fast is the person running? Assume a running step is 1.5 m long. b) A child slides without friction from a height of h along a cuved waterslide. She is launched from a height of h/5 into the pool. it looks as though the angle is 45 degrees in the slide and i need to find the distance or the x value when she lands in the pool. if anyone can help me out here or if you need further info, drop a line. thanks a lot in advance . . . peace . . .