A 90-Kg Box of Oranges Slides from Rest Down a Frictionless

Multiple Choice

A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A.
-What is the speed of the box just before it reaches point A?

A) 98 m/s
B) 21 m/s
C) 9.9 m/s
D) 5.7 m/s
E) 4.4 m/s