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HCV Work and Energy, question 35: Slide has total length of 10 metres and height of 8 metres. A vertical ladder is provided to reach to the top. Boy weighing 200 newtons climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three tenth of his weight. Find the work done by the ladder on the boy as he goes up.

HCV Work and Energy, question 35:


Slide has total length of 10 metres and height of 8 metres. A vertical ladder is provided to reach to the top. Boy weighing 200 newtons climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three tenth of his weight. Find the work done by the ladder on the boy as he goes up.

Grade:12th Pass

3 Answers

Chetan Mandayam Nayakar
312 Points
10 years ago

work done=mass*acceleration*displacement=8*200=1600 J

Sarthak Chaturvedi
18 Points
10 years ago

When the boy is climbing up the ladder,force exerted by the ladder on the boy is perpendicular to his displacement (moving upwards).

Therefore,work done=F.S cos90=0

priteesh ranjan
14 Points
10 years ago

the answer given is zero.. 

by work energy theorem i got the answer as 1600.

if the force is perpendicular to the displacement of the boy then what force causes the boys displacement?

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