Q.

The maximum and minimum distances of a comet from the sun are 8×1012 m and 1.6×1012m. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest?

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a

12

b

60

c

112

d

6

answer is A.

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Detailed Solution

By conservation of angular momentum mvr = constant vmin×rmax=vmax×rmin∴ vmin=60×1.6×10128×1012=605=12m/s
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The maximum and minimum distances of a comet from the sun are 8×1012 m and 1.6×1012m. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest?