Preston Pushes a Wheelbarrow Weighing 480 N to the Top

Multiple Choice

Preston pushes a wheelbarrow weighing 480 N to the top of a 45.0-m ramp,inclined at 22.0° with the horizontal,and leaves it.Tamara accidentally bumps the wheelbarrow.It slides back down the ramp,during which an 85.0-N frictional force acts on it over the 45.0 m.What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s²)

A) 1.4E+3 J
B) 1.6E+4 J
C) 1.2E+4 J
D) 8.1E+3 J
E) 4.3E+3 J