A child runs at a constant speed of 2.00 m/s along a 10.0m horizontal field, then quickly jumps on a massless sled to slide down a tall snowy hill. After sliding for 10.0m (measured along the hill), the child reaches a rough patch with #, = 0.300 and Hk = 0.250 that is 10.0 m long (measured along the hill). What is the speed of the child immediately after the rough patch? The hill is 100m tall (measured vertically) and 200m long. 10 m 200m 100m