A 32-Kg Mass Is Placed at the Top of a Rough

Multiple Choice

A 3.2-kg mass is placed at the top of a rough incline ( $\mu = 0.1$ ) . The incline makes an angle of 32º with the horizontal, and the height of the incline is 2.5 m. The mass is released and slides down to the bottom. The kinetic energy of the mass at the bottom is

A) 78 J.
B) 13 J.
C) 66 J.
D) 23 J.