Question

give me full answer with solution​

Answer 1

Explanation:

As we know that the acceleration in earth is calculated by the formula r2Gm which equals 9.8m/s2 where m is the mass of the earth and r is the radius of the earth.

now,

mass of that planet is half of earth so it's mass is 21(m) and it's radius is half of earth so, it's radius is 21(r)

we will use the same formula to find the gravitational acceleration of that planet which equals 

(21)r2G(21)m=4r22Gm=r22Gm∗2

now, substitute for r2Gm of earth 

=9.8×2=19.6m/s2

so, the value of g on that planet will be 19.6m/s2