Using the acceleration due to gravity at the surface of the Earth as 9.8 m/s^-2, what would be the acceleration due to gravity at the surface of a planet of mass twice that of the Earth and of radius four times that of the Earth?

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

Velocity=total displacement/timefrom house to store is 500 from store to neighbor is 200 therefore total displacement=500+200=700metrestherefore,700metres/910seconds=0.8metres per second