There are already derived equations for rectilinear motion at constant acceleration. For free falling objects, they are further simplified because only the gravitational force is acting on the body. The equations for time and velocity at impact are:
t = √2h/g
v = √2gh
where
h is the height
g is the acceleration due to gravity equal to 9.81 m/s²
1. t = √2(380 m)/9.81 m/s² = 8.8 seconds
2. v = √2(9.81 m/s²)(380 m) = 86.3 m/s
Maybe for the first the hand because there are so many joints that do so many movements and functions.
For the second, the tongue because there are so many taste buds that need to sense and taste and move.
I hope that helps, that's what I remember from elementary school. XD
Its VENUS because the planet is basicily a hot planet
Here's one easy way:
-- Hang an object from a scale. Write down its weight in air.
-- Keep the object hanging from the scale, but let it down into water,
or whatever fluid you're interested in.
-- Read the scale again. Write down its weight in the fluid.
-- Dry everything off, clean up the lab, and go to your office with your notebook.
-- In your notebook, turn to the page with that day's observations.
Notice that the object's weight in air was greater than its weight in the fluid.
-- Subtract the weight in fluid from the weight in air.
The difference is the buoyant force on the object when it's in the fluid.