Question

At perihelion on Feb. 9, 1986, Halley’s comet was 8.79 × 10[sup]7[/sup] km from the Sun and was moving at a speed of 54.6 km s[sup]-1[/sup] relative to the Sun. Calculate its speed (a) when the comet was 1.16 × 10[sup]8[/sup] km from the Sun, and (b) at its next aphelion in the year 2024, when the comet will be 5.28 × 10[sup]9[/sup] km from the Sun.

Answer 1

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