If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? use energy methods.

The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.