400 joules of work is done in raising a 72N weightto a vertical distan

1.	400 joules of work is done in raising a 72N weightto a vertical distance of 5 meters with uniformvelocity. How much work is done against airresistance as the weight is raised?(1) 28 J(2) 40 J(3) 20 J(4) 36 J
Answer» Answer: (2) 40J Explanation: Given that 400joule of work is DONE in RAISING a 72N WEIGHT to a vertical distance of 5 m . So actual work done = f*s = 72×5 = 360J Experienced work = 400j so, work done against AIR resistance is = experienced work done - actual work done 400-360 = 40J answer _______________________ Hope it's helpful

400 joules of work is done in raising a 72N weightto a vertical distance of 5 meters with uniformvelocity. How much work is done against airresistance as the weight is raised?(1) 28 J(2) 40 J(3) 20 J(4) 36 J

Answer»

Answer:

(2) 40J

Explanation:

Given that 400joule of work is DONE in RAISING a 72N WEIGHT to a vertical distance of 5 m .

So actual work done = f*s = 72×5 = 360J

Experienced work = 400j

so, work done against AIR resistance is = experienced work done - actual work done

400-360 = 40J answer

_______________________

Hope it's helpful

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400 joules of work is done in raising a 72N weightto a vertical distance of 5 meters with uniformvelocity. How much work is done against airresistance as the weight is raised?(1) 28 J(2) 40 J(3) 20 J(4) 36 J​