1.

  Crushed ore is dropped on a conveyor belt at the rate of 300 kg/s. The belt moves, it speed of 2 m/s. the net force acting on the belt that keeps it moving at the same speed is:                            

A. 30 N                            
B. 60 N             
C. 300 N/m                       
D. 600 A           
Answer» E.


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