I):final velocity=initial velocity+acceleration due to gravity*time of travel
Therefore,
v=0+9.8*3.1
 =30.38 m/s
If by floor you meant water bed then i think there isn't enough info in the question.
        
             
        
        
        
Answer:
we all know that deforestation is when tress are cut down but this may cause cardio dioxide to go up into the atmosphere and this may cause the rise in sea level and temperates tend to fluctuate 
Explanation:
 I'm just that smart yah dig 
 
        
             
        
        
        
Explanation:
It is given that,
The Displacement x of particle moving in one dimension under the action of constant force is related to the time by equation as:

Where,
x is in meters and t is in sec
We know that,
Velocity,
 
(a) i. t = 2 s

At t = 4 s

(b) Acceleration,

Pu t = 3 s in the above equation
So,

Hence, this is the required solution. 
 
        
             
        
        
        
Answer:
AM radio, FM radio, microwaves, sodium light. 
Explanation:
Electromagnetic radiation are waves from electromagnetic field which spread through the space or any other material medium and carries radiating energy. Examples includes X rays, radio waves, Gamma rays, etc. Exposure to high level of electromagnetic radiation could be harmful to human body, on the other hand, science as not been able to prove that exposing humans to low level electromagnetic radiation is harmful to our health. 
 
        
             
        
        
        
The car's speed is 240km/4hr= 60km/hr.
There's not enough information given in the question to determine its velocity.