Answer:
Explanation:
The forces exerted by each mass is best understood in terms of their momentum. 
Momentum is a sort of compelling force or impulse. It is given as: 
                    Momentum  =  mass x velocity
Let us consider the momentum of the balls;
Substance C; 
     Mass  = 1kg 
      Velocity  = 5m/s
     Momentum of C = 1 x 5  = 5kgm/s 
Substance D: 
       Mass  = 100kg 
       Velocity  = 5m/s
      Momentum of D  = 100kg x 5m/s  = 500kgm/s
Body D has a higher momentum compared to Body C. This suggests that body D will exert a higher force than C when they collide. 
The higher the momentum, the more the force of impact it has. 
 
        
             
        
        
        
Now let’s say you’re on the Moon. If you were to drop a hammer and a feather from the same height, which would hit the ground first?
Trick Question! On the moon both objects would hit the ground at the same time. On Earth, the hammer lands first. 
So yeah, the student is right. Galileo gave us this theory long ago.
 
        
             
        
        
        
Answer:
 its B because we're not talking about mass even tho most people would have chosen A cuz it says mass and u they would think its apart of density but if ur testing to see density ur figuring out which object will sink and which one will float so da reason why da penny snuck it cuz da density is greater den da water and copper has a better chance of sinking den floating so dats why its B I hope dis helps :3