EVERYDAY SCIENCE

Detailed explanation-1: -When gravity pulls objects toward the ground, it always causes them to accelerate at a rate of 9.8 m/s2. Regardless of differences in mass, all objects accelerate at the same rate due to gravity unless air resistance affects one more than another.

Detailed explanation-2: -The acceleration due to gravity near the earth’s surface is 9.8 m/s2, and the earth’s radius is 6400 km.

Detailed explanation-3: -It should be noted that the strength of gravity is not a constant-as you get farther from the centre of the Earth, gravity gets weaker. It is not even a constant at the surface, as it varies from  9.83 at the poles to  9.78 at the equator. This is why we use the average value of 9.8, or sometimes 9.81.

Detailed explanation-4: -In practice, the velocity of an object increases by 9.8 m/s2 ( the value of the acceleration due to the gravity on earth ). Therefore an object’s velocity is 9.8 m/s 1 second after it begins to fall. Its velocity will further keep on increasing with time because of the acceleration due to gravity.

Detailed explanation-5: -The acceleration g varies by about 1/2 of 1 percent with position on Earth’s surface, from about 9.78 metres per second per second at the Equator to approximately 9.83 metres per second per second at the poles.