Explanation:
Relation between potential energy and charge is as follows.
            U = qV
or,    
                    = 
                    =  J
 J
or,                = 
Therefore, we can conclude that change in the electrical potential energy  is
 is  .
.
 
        
             
        
        
        
Answer:
2000 kg m/s
Explanation:
The momentum of an object is a vector quantity whose magnitude is given by

where
m is the mass of the object
v is the velocity of the object
and its direction is the same as the velocity.
In this problem, we have:
- Spaceship 1 has
m = 200 kg (mass)
v = 0 m/s (zero velocity)
So its momentum is

- Spaceship 2 has
m = 200 kg (mass)
v = 10 m/s (velocity)
So its momentum is

Therefore, the combined momentum of the two spaceships is

 
        
             
        
        
        
D. It happens all the time
        
             
        
        
        
Spring potential energy:
E = 0.5 * k * x²
k spring constant
x spring compression
x = √(2 * E / k) = 0.7