[fckin]

Too bad the gravitation constant is 9.8

[zokier]

Actually the gravitation constant is 6.67×10^-11 N m^2/kg^2. Gravitational acceleration on earths surface is on average 9.81 m/s^2, and not really a constant (it varies slightly from place to place).

[garindra]

Relevant : http://www.quora.com/Why-does-gravitational-acceleration-dif...