A thought experiment on gravitation.... Let us suppose we have a very large planet X which is assumed to have some acceleration 'a'. Suppose we keep on digging a well and afterwards we drop a small mass 'm' then due to the force there will be an acceleration. As acceleration is change in velocity with change in time hence the velocity keeps on increasing as the ball falls further down then is it possible that the mass 'm' will acquire the velocity of light 3x10^8 m/s?? If not then why (the body is accelerating)? If it will then what happens next, as in can it go any faster than light??