2) in order to generate electricity from mechanical energy, one essential element needed to transform the energy into electrical energy is

In order to generate the electricity from mechanical energy, the generator is needed.

The generator, which converts Mechanical energy in to Electrical energy, by magneto induction, which is when voltage induced by change in magnetic field.

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.