Question

A man exerts a maximum force of 400 N. He has
to pull a mass of 150 kg to a height of 1.5 m by
using an inclined plane. The inclined plane has
efficiency of 80%. What should be the minimum
length of the plane? Use g = 10 m/s2.
[Ans: 7 m]​

Answer 1

Answer:

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Answer 2

answer is 7m but my answer is coming 7.03m

I have explain line by line

please mark be

Explanation:

given,

effort= 400N

mass=150kg

g=10m/S2

load= mg

=150×10

= 1500N

height= 1.5m

efficiency= 80%

we know,

efficiency= output work / input work × 100%

or, 80%= l×h/e×l × 100%

or,80= 1500×1.5/400×l. ×100%

or, 400×80=1500 ×1.5 ×100

or, 32000l= 225000

or, l= 32000/225000

or, l= 7.03m

proved