Question

please give me a answer correctly​

Answer 1

${ \boxed{\boxed{\begin{array}{cc} \bf \: given \\ \rm \to \:period \: \: T = 24 \: \: h \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \rm \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 24 \times 60 \times 60 \: s \\ \\ \rm \to \:radius \: \: r = 42250 \: km \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \rm = 42250 \times 1000 \: m \\ \\ \rm \to \: speed \: \: v = \: to \: find \\ \\ \\ { {\boxed{\begin{array}{cc}\rm \to \:we \: know \: that \\ \\ \rm \: v = \omega \: r \\ \\ \rm = \frac{2\pi}{T} \times r \\ \\ \rm = \frac{2 \times 3.14}{24 \times 60 \times 60} \times 42250 \times 1000 \\ \\ =3070 .9 \: m {s}^{ - 1} \\ \\ = 3.07 \: km {s}^{ - 1} \\ \\ \therefore \rm \: \: speed \: \: v = 3.07 \: km {s}^{ - 1} \end{array}}}} \\ \\ \end{array}}}}$

So option (3) is the correct answer