A 57.5-kg skateboarder starts out with a speed of 1.80 m/s. He does 80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is 6.20 m/s. Solve symbolically for the change in the skater’s height, ∆h, in terms of ∆PE, m and any fundamental constant(s), if necessary.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

prndulum needs thread, weight clock to time swings

the ima (higher than 1m) will be greater than the ima with the height of 1m.