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D A 100-kg pilot takes his airplane into a 1.5-km vertical loop at a speed of 300 m/s at the
bottom of the loop. If his speed remains constant, determine:
a) The force of the seat onto the pilot at the top of the loop
b) The force of the seat onto the pilot at the bottom of the loop
c) The required speed of the plane at the top of the loop if the pilot were to appear
weightless

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