A horizontal spring attached to a wall has a force constant of k = 790 Mm. A block of mass m = 1.30 kg is attached to the spring and rests on a horizontal, frictionless surface as in the gure below. WJNWIWNM ~ x=0 x=x,/2 x: x, Q) (a) The block is pulled to a position x'. = 6.20 cm from equilibrium and released. Find the elastic potential energy stored in the spring when the block is 6.20 cm from equilibrium and when the block passes through equilibrium. x (cm) Elastic Potential Energy (J) 6.20 E 0 E (b) Find the speed of the block as it passes through the equilibrium point. m/s (c) What is the speed of the block when it is at a position Xj/Z = 3.1 cm? m/s (d) Why isn't the answer to part (c) half the answer to part (b)? This answer has not been graded yet. Need Help