A 16-kg sled starts up a 28° incline with a speed of 2.4 m/s. The coefficient of kinetic friction is

A 16-kg sled starts up a 28° incline with a
speed of 2.4 m/s. The coefficient of kinetic friction is  0.25. (a) How far
up the incline does the sled travel? (b) What condition must you put on the
coefficient of static friction if the sled is not to get stuck at the point
determined in part (a)l (c) If the sled slides back down, what is its speed
when it returns to its starting point?