Answer:
(a) 1 : 2 
(b) same 
Explanation:
Let the mass of puck A is m and the mass of puck B is 2 m.
initial speed for both the pucks is same as u and the distance is same for both is s. 
let the tension is T for same.
The kinetic energy is given by 

(a) As the speed is same, so the kinetic energy depends on the mass. 
So, kinetic energy of A : Kinetic energy of B = m : 2m  = 1 : 2 
(b) A the distance s same so the final velocities are also same. 
 
        
             
        
        
        
In exothermic reactions, heat and light are released to the surrounding environment. On the other hand, in an endothermic reaction, heat is required and therefore it can be considered as a reactant.
- In exothermic reactions, light and heat are released into the environment (Option D).
- Exothermic reactions release energy in the form of heat or light.
- Combustion reactions are generally exothermic reactions.
- After an exothermic reaction takes place it is possible to observe that the energy of the products of the reaction is lesser than the energy of the reactants. 
- The energy released in exothermic reactions is evidenced by the increase in temperature of the reaction.
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It’s the wavelength I believe
        
             
        
        
        
The buoyant force exerted by a liquid is equal to the weight of the fluid <span>displaced.</span>