Answer:
her acceleration is 1 m/sec
Explanation:
The following information is given in the question 
The initial velocity is 5 m/s
After 10 seconds, she would be moved at 15 m/s
We need to find the acceleration 
As we know that
Acceleration = Change in speed ÷ time
Acceleration = (15 - 5) ÷ (10)
= 1 m/sec
Hence, her acceleration is 1 m/sec
The same would be considered  
 
        
             
        
        
        
Answer:

Explanation:
Mass of the helium gas filled inside the volume of balloon is given as




now total mass of balloon + helium inside balloon is given as


now we know that total weight of balloon + cargo = buoyancy force on the balloon
so we will have




 
        
             
        
        
        
Answer:
a) 
 
   
b) 

  
Explanation:
Searching the missed information we have:                                        
E: is the energy emitted in the plutonium decay = 8.40x10⁻¹³ J
m(⁴He): is the mass of the helium nucleus = 6.68x10⁻²⁷ kg  
m(²³⁵U): is the mass of the helium U-235 nucleus = 3.92x10⁻²⁵ kg            
a) We can find the velocities of the two nuclei by conservation of linear momentum and kinetic energy:
Linear momentum:


Since the plutonium nucleus is originally at rest,  :
:
 
  
 (1)
    (1)
Kinetic Energy: 

 
    
 (2)
   (2)     
By entering equation (1) into (2) we have:
 
  
 
   
Solving the above equation for  we have:
 we have:

And by entering that value into equation (1):
 
                         
The minus sign means that the helium-4 nucleus is moving in the opposite direction to the uranium-235 nucleus.
b) Now, the kinetic energy of each nucleus is:
For He-4:

For U-235:

  
I hope it helps you!                                                                                    
 
        
             
        
        
        
Answer: The answer is B
Explanation: It is staying in a steady speed position
 
        
                    
             
        
        
        
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