A microscope is locused on a mark on a table. When the mark is covered by the plate of glass 3.00cm thick, the microscope had to be raised 1.18cm for the mark to be once more in focus . calculate the refractive index of the glass

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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