A 20-Kg Block Slides on a Frictionless 15 $\degree$ Inclined Plane

Multiple Choice

A 2.0-kg block slides on a frictionless 15 $\degree$ inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s² down the incline.What is the applied force?

A) 8.1 N down the incline
B) 3.0 N down the incline
C) 2.1 N up the incline
D) 3.0 N up the incline
E) 8.1 N up the incline