Physics: What is the difference in time between a 3 second to 11 second interval

What is the difference in time between a 3 second

NeriyahY

28.05.2020

its 11 s - 3 s = 8 s

And time cannot be negative.

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365371

01.11.2020

Efficiency $=\frac{10000}{12000}=0.8333=83.33$ %

So option (D) will be correct answer

Explanation:

We have given Lucy needs to lift a crate to a shelf

20 m high

Work done by lucky on machine = 12000 J

Force exerted by machine F = 500 N

Distance d = 20 m

So work done by machine $=500\times 20=10000J$

So efficiency $=\frac{10000}{12000}=0.8333=83.33$ %

So option (D) will be correct answer

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