A 2.8 kg block moving along the x axis is acted upon by a single horizontal force that varies with the block’s position according to the equation Fx = a x2 + b , where a = 8 N/m2 , and b = −3.9 N. At 1.7 m, the block is moving to the right with a speed of 3.8 m/s. Determine the speed of the block at 2.5 m. Answer in units of m/s.