(3%) Problem 4: A hockey puck of mass m is shot across a rough floor in a straight line. The puck moves in the positive x direction, and the coefficient of friction between the floor and the puck depends on position as (x ) = a + bx, where a is a dimensionless constant and b is a constant with units of m". @theexpertta.com - tracking id: 9N69-4E-C3-45-84AD-30565. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictly forbidden. Doing so may result in termination of your Expert TA Account. & Write an expression for the work done by kinetic friction as the puck moves from x = x] to x = x2. Your answer should be in terms of m, x1, x2, a, b, and g (the acceleration due to gravity). Grade Summary W= Deductions 0% Potential 100%(3%) Problem 19: Two people, each with a mass of 68.9 kg, are paddling their canoe downstream with a speed of 1.5 m/s relative to the water, in a river that flows with a speed of 3.74 m/s with respect to the shore. @theexpertta.com - tracking id: 9N69-4E-C3-45-84AD-30565. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictly forbidden. Doing so may result in termination of your Expert TA Account. & What is the magnitude of the total momentum of the people, in kg m/s, with respect to the shore? Grade Summary P = kg.m/s Deductions 0%