Calculate the mechanical energy of the child at position 1, position 2, and on position 3 and its total mechanical energy of the boy. If the boy has a mass of 45 kg, where the velocity of the boy at position 2 is 5.6 m/s with the height of 1 m and at position 3 is 8.5 m/s with the height of 2.8 m. I SWEAR TO GOD IF YOU DON'T ANSWER IT PROPERLY

PLS ANSWER PROPERLY TO BE BRAINLIEST ❤️❤️❤️

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)