In the figure here , a stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction , where they stop . Piece L , with a mass of 4.0 kg, encounters a coefficient of kinetic friction mu 1 =0.58 and slides to a stop in distance d L =0.40 m . Piece Rencounters a coefficient of kinetic friction mu R =0.44 and slides to a stop in distance d R =0.44 m . What was the mass of the block?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.