Example for a soap-box cart that is pushed
up a hill that it barely makes it over, comes down the other side to ground
the same level, and then the brake is applied.
MEbefore push= KEafter
push =
KEhalfway up + GPEhalfway
up = KEat top + GPEat top =
KEhalfway down + GPEhalfway
down = KEat bottom =
KEapplying break + IEapplying
break = IEstopped