Using energy considerations, calculate the average force a 60.0 kg sprinter exer

Question

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 8.50 m/s in a distance of 25.0 m, if he encounter a headwind that exerts an average force of 30.0 N against him. (a) How much gravitational potential energy (relative to the ground on which it is built) is stored in an Egyptian Pyramid, given its mass is about 9 x 10^9 kg and its center of mass is 38.0 m above the surrounding ground? (b) What as the ratio of this energy to the daily food intake of a person (1.2x10^7 J)? In example 6.6 we found the speed of a roller coaster that had descended 19.0 , was only slightly greater when it had an initial speed of 4.00 m/s than when it started from rest. This implies that triangle PE > > KE1. Confirm this statement by taking the ratio of triangle PE to Kei. (Note that mass cancels)

Explanation / Answer

Increase in KE =

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