2.
An object when thrown upwards reaches a certain height and then falls downwards. Whenever an
object falls towards the earth, acceleration is involved. This acceleration is due to the earth’s
gravitational force. Therefore, this acceleration is called the acceleration due to the gravitational
force of the earth (or acceleration due to gravity). It is denoted by g. The unit of g is the same as that
of acceleration, that is, m/s
2
. It value is 9.8 m/s2 on Earth. When discussing the acceleration of
gravity, it was mentioned that he value of g is dependent upon location. There are slight variations in
the value of g on earth’s surface. The following acceleration of gravity values can be calculated for the
various planets.
Planet g (m/s2
)
Mercury 3.61
Venus 8.83
Mars 3.75
Jupiter 26.0
Saturn 56 / 5
Uranus 21 / 2
Neptune 13.3
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gravity
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FDFVDDGVDXVGFDVXVF X
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