Question

pls solve this question

Answer 1

let us suppose it takes time t for travelling with radius
$1.5 \times {10}^{7} m$
ATQ

$t = \frac{ {1.5 \times10 }^{7} }{5 \times {10}^{3} } \\ \\ t = 3000 \: s$
speed when it is at radius
$0.5 \times {10}^{7} m$
=
$\frac{0.5 \times {10}^{7} }{3000} \\ \\ 1.67 \times {10}^{3} m {s}^{ - 1}$