Answer:
Burning of canful of petrol will release more energy 
Explanation:
If you like my answer than please mark me brainliest
 
        
             
        
        
        
A. The particles are packed more tightly in materials with more density which causes the vibrations to bounce of the partials more rapidly which makes them go faster
        
             
        
        
        
Answer:

Work  done to bring three electrons from a great distance apart to 3.0×10−10 m from one another (at the corners of an equilateral triangle) is 
Explanation:
The potential energy is given by:
U=Q*V
where:
Q is the charge
V is the potential difference
Potential Difference=V=
So,

Where:
k is Coulomb Constant=
q is the charge on electron=
r is the distance=
For 3 Electrons Potential Energy or work Done is:


Work  done to bring three electrons from a great distance apart to 3.0×10−10 m from one another (at the corners of an equilateral triangle) is 
 
        
             
        
        
        
By definition, the speed of an object is given by:

 Where,
 dr/dt: derived from the position with respect to time
 Therefore, speed has units of length over units of time.
 Thus, speed is a derived quantity, since it depends on the value of two other quantities.
 Answer:
 a derived quantity is:
 C. Speed