Better technology is helping us because we can see more stuff like the microscope we able to make assumptions based on what we saw.  
        
             
        
        
        
Answer:
The initial velocity is 50 m/s.
(C) is correct option.
Explanation:
Given that,
Time = 10 sec
For first half,
We need to calculate the height
Using equation of motion

 ....(I)
....(I)
For second half,
We need to calculate the time
Using equation of motion



Put the value of h from equation (I)


According to question,


Put the value of t₁ and t₂



Here, g = 10 
The initial velocity is


Hence, The initial velocity is 50 m/s.
 
        
             
        
        
        
Answer:
0.911 atm
Explanation:
In this problem, there is no change in volume of the gas, since the container is sealed.
Therefore, we can apply Gay-Lussac's law, which states that:
"For a fixed mass of an ideal gas kept at constant volume, the pressure of the gas is proportional to its absolute temperature"
Mathematically:

where
p is the gas pressure
T is the absolute temperature
For a gas undergoing a transformation, the law can be rewritten as:

where in this problem:
 is the initial pressure of the gas
 is the initial pressure of the gas
 is the initial absolute temperature of the gas
 is the initial absolute temperature of the gas
 is the final temperature of the gas
 is the final temperature of the gas
Solving for p2, we find the final pressure of the gas:

 
        
             
        
        
        
The SI unit for acceleration is m/s2 ( D)
 
        
             
        
        
        
Answer:
The north pole has the strongest magnetic force