20 th sum
I need to find acceleration to find the net force so I'm using Vx=Vxo+axt
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Actually, a=(v2-v1)/(t2-t1)
you have to find the acceleration between point B and C. and you can see that there is no increase in velocity between B and C.
a= (20-20)/(4-2) = 0/2=0 and F= ma = 20000 * 0 ms^-2
Your net force will be 0 between B and C.
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