A contestant in a winter games event pushes a 51.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (Assume ? = 20°.) a) Calculate the minimum force F (in N) he must exert to get the block moving. b) What is its acceleration (in m/s 2 ) once it starts to move, if that force is maintained? Can someone please help me with part b? Thank you! A contestant in a winter games event pushes a 51.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (Assume e 20°.) (a) Calculate the minimum force F (in N) he must exert to get the block moving. 55.2 What is its acceleration (in m/s2) once it starts to move, if that force is maintained? 2 0.78 (b) Consider Newton\'s Second Law. m/s Solution Let the force is F Fcos(theta)=us*N Fsin(theta)+N=mg N=mg-Fsin(20)= Fcos(20)=0.1*(51*9.8-Fsin(20)) F=51.3 N let acceleration is a 51.3*cos(20)-0.03*(51*9.8-51.3sin(20))=51a a=0.67 m/s^2 .