A 50-Kg Crate Is Pulled Across a Smooth Floor Using $2$

Multiple Choice

A 50-kg crate is pulled across a smooth floor using a rope. The crate is accelerating at 1 m/s $2$ and the rope makes an angle of 50° with the floor. The normal force is

A) 430 N.
B) 540 N.
C) 390 N.
D) 490 N.