mass of a body is 25 kg, what's its weight in newton on earth, the body is carried to a planet whose mass is 2 times the mass of earth and half of its radius, what will its weight be on another planet
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Acceleration due to gravity of earth,
g = G * M/ R2 = 9.8 m/s2
If mass of planet, m = 
And radius of planet, r = 
Acceleration due to gravity on the surface of the planet will be:
g = G * m / r2 (i)
m =  (ii)
r =  (iii)
Put (ii) and (i) in equation (i), we get
g =  * (G * M / R2)
g = 2 * 9.8 m/s2
g = 19.6 m/s2
g = G * M/ R2 = 9.8 m/s2
If mass of planet, m = 
And radius of planet, r = 
Acceleration due to gravity on the surface of the planet will be:
g = G * m / r2 (i)
m =  (ii)
r =  (iii)
Put (ii) and (i) in equation (i), we get
g =  * (G * M / R2)
g = 2 * 9.8 m/s2
g = 19.6 m/s2
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