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# Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. The scale reads 830 N for the first 3.8 s after the elevator starts m

Question

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. The scale reads 830 N for the first 3.8 s after the elevator starts moving, then 930 N for the next 3.8 s. What is the elevator’s speed 7.6 s after starting?

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Physics
1 year
2021-09-05T08:18:34+00:00
2021-09-05T08:18:34+00:00 1 Answers
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Answer:v= 4.0 m/sExplanation:[tex]F_{g} = m*g = 95 kg * 9.8 m/s2 = 930 N (1)[/tex]

[tex]F_{net} = F_{g} -F_{n} = m*a\\ F_{net} = 930 N – 830 N = 100 N = 95 Kg * a[/tex]

[tex]a =\frac{F_{net} }{m} =\frac{100 N}{95 kg} = 1.05 m/s2[/tex]

[tex]v_{f} = a* t = 1.05 m/s * 3.8 m/s = 4.0 m/s[/tex]