1. The problem statement, all variables and given/known data 1.) A 70kg boy runs as fast as he can up a flight of stairs which has vertical height of 10metres. He achieves this in 8 seconds. Calculate the average rate of energy transfer into gravitational potential energy that must have occured. 2.) A700kg car travelling at 20ms-1 breaks to rest in 5 seconds. Calculate the rate of energy dissipation the car must achieve. Hello, i am not certain how to calculate these.