A 25-Kg Box Is Sliding Down an Ice-Covered Hill

Multiple Choice

A 25-kg box is sliding down an ice-covered hill.When it reaches point A, the box is moving at 11 m/s.Point A is at the bottom of a circular arc that has a radius R = 7.5 m.What is the magnitude of the normal force on the box at Point A?

A) 250 N
B) 280 N
C) 400 N
D) 650 N
E) 900 N