A weightlifter lifts a 100-kg weight 1.5 meters off the floor at a constant velocity. Which statement about this situation is true? The mechanical energy of the system increased because of friction.

The mechanical energy of the system decreased because of friction.

The kinetic energy of the weight decreased as it was lifted up.

The potential energy of the weight decreased as it was lifted up.

1) c. The energy on the macroscopic scale decreased, and the energy on the molecular scale increased.

2) d.  Friction converts some energy on the macroscopic scale to energy on the molecular scale.

3) d. The mechanical energy of the system decreased because of friction.

4) d. The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.

5) d. The mechanical energy of the system decreased due to the transfer of energy on a macroscopic scale to energy on a molecular scale.

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Explanation:

Because they are a legend!

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle