How fast (metric units) is a ball going after 3.0 seconds if you drop it off a very high building?

It would be 9.8 m/s^2 since gravity is a constant speed, right?

Question

How fast (metric units) is a ball going after 3.0 seconds if you drop it off a very high building?

It would be 9.8 m/s^2 since gravity is a constant speed, right?

anonymous · Answer

If there is no external force acting on a free falling body then it must fall with the speed of 9.8 m/s^2(acceleration due to gravity) irrespective of its mass or any physical quantity.

anonymous · Answer

Acceleration due to gravity is always different on different planets. which depends on the density of the celestial body.

anonymous · Answer

So the answer wouldn't be 29.4 m/sec^2?

anonymous · Answer

or actually -29.4 m/sec^2

anonymous · Answer

v=v0-gt 
v0 = 0 
v = -gt 
v = -9.8 * 3 
= -29.4 m/s
???

anonymous · Answer

Since they just want how fast and not which direction, you can ignore the - sign, so just 29.4m/s

anonymous · Answer

for a free fall
$$u=0$$
$$g=9.8 m/s ^{2}$$
putting this value in 
v=u+gt
we get
$$v=0+9.8*3 $$
(since time is 3 second)
therefore v=29.4$$m/s$$