Question

Answer should be netween 200-400J

A boy in a wheelchair (total mass 53.5 kg) has speed 1.40 m/s at the crest of a slope 230 m high and 12.4 m long. At the bottom of the slope his speed is 7.00 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride 740 02 Your response differs from the correct answer by more than 100%

Answer 1

given v=7m's uz l'umis me 53.5kg frictional force (f 12 41.0N 1 = 12.4 m h = 2. 3om 1 Apply low of Conservation of energy W wheelchair & mgh = /2mv ² - I mv.) + F-d. Wwwheelchain + 53.5x9:91X 2.30m = 53.5 (1736 - (- ) + 4/8 12:4 Wwheelchair + 1207112 = 1278.32 + Tos I W Whed chair = 560.83 8 Joule