Preston Pushes a Wheelbarrow Weighing 490 N to the Top

Multiple Choice

Preston pushes a wheelbarrow weighing 490 N to the top of a 45.0-m ramp,inclined at 20.0° with the horizontal,and leaves it.Tamara accidentally bumps the wheelbarrow.It slides back down the ramp,during which an 80.0-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) 3,942 J
B) 17,120 J
C) 11,142 J
D) 7,542 J
E) ​1,231 J