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Q.

A planet is orbiting a star when for no apparent reason the star’s gravity suddenly vanishes. After which planet moves in a straight line. Mark the correct statement(s):

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a

Newton’s first law is obeyed on planet after gravity vanishes.

b

Kepler’s law of areas is obeyed only till the planet is in gravity of star.

c

Kepler’s law of areas is obeyed even after gravity vanishes.

d

Angular momentum of planet about centre of star is conserved through out its motion.

answer is A, D, C.

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Detailed Solution

No external torque is acting in this case too. So, Kepler’s law of areas is obeyed in this case too.

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