Regardless of weight, all objects on Earth, neglecting all forces except gravity, fall with a constant acceleration of 32.2 ft/s^2. That means that in one second an object will go from a velocity of zero to 32.2 ft/s. After 2 seconds it will achieve a velocity of 64.4 ft/s, 96.6 ft/s after 3 seconds and so on and so forth ad infintum, again, neglecting all other forces like wind resistance.
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1,000 milliseconds
Exactly as it sounds. It is 100 times shorter than a second.
The mass is irrelevant. If the object is in free fall (that is, air resistance can be neglected), an object will fall 4.9 meters in one second.
The answer is in the question. 40 m/s is how fast it is going. This means in one second, the object has traveled 40 meters. Relatively fast compared to walking or driving.
60 sec = 1 minute 60 min = 1 hour 3600 sec = 1 hour one mile/sec = 3600 mph - pretty fast!