Question

if mass of earth is doubled and radius halved with respect to original dimensions then will be the value of g2 (a.891 b.491. c.691. d991)​

Answer 1

$g = \frac{GM} {R^{2} } \\ \\ {g}^{1 } = \frac{2GM}{ { (\frac{R}{2} )}^{2} } \\ \\ {g}^{1} = \frac{8GM}{ {R}^{2} } \\ \\ {g}^{1} = 8g$

${g}^{1} = 78.4$

hope it helps