Answer:
 gravitational force
 gravitational force
  electrostatic force
 electrostatic force
Explanation:
The forces that balloons may exert on each other can be gravitational pull due to the mass of the balloon membrane and the mass of the gas contained in each. This force is inversely proportional to the square of the radial distance between their center of masses.
The Mutual force of gravitational pull that they exert on each other can be given as:

where:
 gravitational constant
 gravitational constant  
 are the masses of individual balloons
 are the masses of individual balloons
 the radial distance between the  center of masses of the balloons.
 the radial distance between the  center of masses of the balloons.
But when  there are charges on the balloons, the electrostatic force comes into act which is governed by Coulomb's law.
Given as:
 
where:

 are the charges on the individual balloons
 are the charges on the individual balloons
R = radial distance between the charges.
 
        
             
        
        
        
Answer:
4.2 m/s
Explanation:
Momentum is conserved.
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
(35 g) (9 m/s) + (75 g) (-7 m/s) = (35 g) (-15 m/s) + (75 g) v
315 g m/s − 525 g m/s = -525 g m/s + (75 g) v
315 g m/s = (75 g) v
v = 4.2 m/s
 
        
                    
             
        
        
        
Silt and other wash can accumulate behind the motor and if other boats are added they can get their hulls damaged or scraped then, depending on the size of the material. It can also cause trailers to get stuck if they drive into the place from where the boat came.
        
             
        
        
        
Apply: 
wavelength = speed of wave / frequency
wavelength = 12 m/s / 4 Hz = 48 m