A 25-Kg Child Starts from Rest at the Top of a Slide

A 25-kg child starts from rest at the top of a slide inclined at 27 ^$\circ$ relative to the horizontal.The slide is 6.0 m long.The coefficient of the kinetic friction of the slide is 0.25.When reaching the bottom of the slide,the child's speed is:

A) 5.2 m/s
B) 4.0 m/s
C) 7.3 m/s
D) 6.5 m/s