Kepler's second law regarding the constancy of areal velocity of a planet is a consequence of the law of conservation of

Options

A. energy
B. angular momentum
C. linear momentum
D. None of these

Answer

B

Explanation

dA=Area swept in time dt=`1/2r^2d theta`
`(dA)/(dt)=1/2r^2 (d theta)/(dt)=1/2 r^2 omega =L/(2m)`
`(dA)/(dt)` = constant if L=constant