A 30 kg girl goes down a slide at an amusement park, reaching the bottom with a velocity

of 2.5 m/s. The slide is 10.0 m long and the top end is 4.0 m above the bottom end,

measured vertically.

a. What is her gravitational potential energy at the top of the slide, relative to the bottom? (1.2

x 103J)

b. What is her kinetic energy when she reaches the bottom? (94 J)

c. How much energy is lost due to friction? (1.1 x 103J)

d. Calculate the average frictional force acting on her as she goes down the slide. (-1.1x102N)