A horizontal spring attached to a wall has a force constant of k = 840 Mm. A block of mass m = 1.90 kg is attached to the spring and rests on a frictionless, horizontal surface as in the gure below. x=0 x=x,~/2 x=xi (a) The block is pulled to a position x1. = 6.20 cm from equilibrium and released. Find the potential energy stored in the spring when the block is 6.20 cm from equilibrium. J (b) Find the speed of the block as it passes through the equilibrium position. x Your response differs from the correct answer by more than 10%. Double check your calculations. mfs (c) What is the speed of the block when it is at a position Xi/Z = 3.10 cm? :1 m