A 10kg block of ice slides down a ramp 20m long, inclined at 10 degrees to the horizontal. If the ramp is frictionless, what is the acceleration of the block of ice? Struggling as to where to start, I have the formulae, just dont know how to use them. Most of the questions I've encountered had a force as a given, so now I'm getting a bit confused here. Would Ff = umg still be any good here?