An earth satellite remains in orbit at a distance of 9022 km from the center of the
earth.
What is its period? The universal gravitational constant is 6.67 × 10−11 N · m
2
/kg2
and the mass of the earth is 5.98 × 1024 kg.

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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the answer is 3.1 his answer is wrong mines is right

ice to water 1 water to vapour 2 latent heat