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Soloha48 [4]
3 years ago
10

I'm new to brainy, but here is my question.

Physics
2 answers:
skad [1K]3 years ago
8 0

680 is the right answer

Fittoniya [83]3 years ago
7 0

Answer: 680 J

Explanation:

Andre's mechanical energy is given by:

E=K+U

where

K is the kinetic energy

U is the gravitational potential energy

The kinetic energy in this case is zero, because Andre is sitting, so its speed is zero: v=0, and the kinetic energy is

K=\frac{1}{2}mv^2=\frac{1}{2}(77.1 kg)(0)^2=0

The gravitational potential energy is instead

U=mgh=(77.1 kg)(9.8 m/s^2)(0.90 m)=680.0 J

So, the total mechanical energy is

E=U=680.0 J

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