A child and sled with a combined mass of 54.0 kg slide down a frictionless slope. If thesled starts from rest and has a speed of 3.80 m/s at the bottom, what is the height of thehill?m Can sum1 please help me with this problem and show me how itsdone?

1) sections 1, 2, and 10 are significant primarily because they suggest the likelihood that a) widow wycherly is actually the woman in the full-length portrait. b) dr. heidegger wants to include his guests in an experiment with the water. c) dr. heidegger plans to drink some of the water from the vase and needs witnesses. d) the guests will be asked to witness dr. heidegger's transformation when he drinks the water.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?