A box with mass m = 0.100 kg is at rest and placed against a compressed spring at the bottom of a ramp that is at an angle ̴̵̶̷̸̡̢̧̨̛̖̗̘̙̜̝̞̟̠̣̤̥̦̩̪̫̬̭̮̯̰̱̲̳̹̺̻̼͇͈͉͍͎̈́̃̆̇̈̉̑̒̓̔̽̾̿̀́͂̓̈́͆͊͋͌̕̚ͅ͏͓͔͕͖͙͚͐͑͒͗͛ͣͤͥͦͧͨͩͪͫͬͭͮͯ͘͜͟͢͝͞͠͡ͰͱͲͳʹ͵Ͷͷͺͻͼͽ;Ϳ΄΅Ά·ΈΉΊΌΎΏΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθ = 45.0 degrees above the horizontal. The compressed spring has elastic potential energy stored of Usp = 6.00 J. The spring is released, and the box moves up the incline. After the box has traveled a distance s = 3.00 m up the ramp, its speed is 4.00 m/s.
What is the magnitude of the friction force that the ramp exerts on the box while the box is moving? *** You do not need to know μk ***