work and energy

Question

 A child of mass m = 27 kg slides down a slide of height h = 2.6 m without friction. Let gravitational potential energy be zero at ground level.

a) write an expression for the childs total mechanical energy, E, at the top of the slide in terms of the variables in the problem and the acceleration due to gravity, g. E=

b) calculate the change in the childs potential energy U in joules from the top to the bottom of the slide at ground level

c) what is the childs final speed Vf in m/s?

Answer 1