Hey again, once again I have no idea where to start on an equation that I recieved on a quiz A 70 kg skater initially moving at 10.0 m/s across the ice drags the rough part of one skate along the ice, slowing herself to 4.0 m/s over a 2.0 s period of time. What is the magnitude (a positive number) of the frictional force on her during the time she is slowing down? [Assume her acceleration is constant.] I did some models with force diagrams and such on my own, but once again I couldn't really figure out anything from them. If someone could once again point me in the right direction generally on how to go about this I would be extremely greatful. Thank you in advance.