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A 55 kg man holds a weight of 20 kg on his head .What is the work done by him against gravity if he moves a distance of 20 m on an incline of 1 in 5.Take g=10 metre per second square .

A 55 kg man holds a  weight of 20 kg on his head .What is the work done by him against gravity if he moves a distance of 20 m on an incline of 1 in 5.Take g=10 metre per second square .

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2 Answers

Eshan
askIITians Faculty 2095 Points
3 years ago
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Alisha Talreja
17 Points
11 months ago
Most understandable Theoritical Approach : 
1 in 5 means he is moving a ratio of 1 (in height i.e. perpendicular) to a ratio of 5 (on ground i.e. base) .now it is gi8ven he is moving 20m on this incline ,therefore -
 distance = 1/5 x 20 = 4 m is his actual distance
 
Now -
work= force x disp 
force = (M+m)g = (55+20)10 = 750N
WORK = 750 X 4 = 3000N (ans)           
 

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