in march 2006, two small satellites were discovered orbiting pluto, one at a distance of 48,000 km and the other at 64,000 km. pluto already was known to have a large satellite charon, orbiting at 19,600 km with an orbital period of 6.39 days.

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

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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explanation:

your answer is, orbit around the nucleus