N :\"ollcy initially travels along a horizontal portion ofa smooth track at a uniform speed in : 1.2 m s". It then travels up the inclined portion and comes to rest at the upper horizontal portion ofthe track. The lower and upper portions ofthe track are h m apart. Now the trolley travels at a uniform speed of u = 1.3 m 5". What would be the speed v of the trolley along the upper portion? A. 0.lms" B 0.25ms'l c. 0.5ms" D. 0.75m"