- Can square root or absolute value equal to zero. or is it no solution?

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I =n*A*e*vd.current is a scalar qty.from eqn. ,n,A&e are conts.hence,I is proportional to vd. Shouldn't I b a vector qty as Vd is vctor qty? I need some help with this motion problem.? If evolution is true, why are there still potatoes? They should have evolved into french fries? Kindly solve this? Prove that any self complementary graphs has 4n or 4n +1 points? How do the mice stay hydrated?