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Answer:
The point at which the electrical potential is zero is x = +0.33 m.
Explanation:
By definition the electrical potential is:

Where:
K: is Coulomb's constant = 9x10⁹ N*m²/C²
q: is the charge
r: is the distance
The point at which the electrical potential is zero can be calculated as follows:

(1)
q₁ is the first charge = +3 mC
r₁ is the distance from the point to the first charge
q₂ is the first charge = -6 mC
r₂ is the distance from the point to the second charge
By replacing r₁ = 1 - r₂ into equation (1) we have:
(2)
By solving equation (2) for r₂:

Therefore, the point at which the electrical potential is zero is x = +0.33 m.
I hope it helps you!
Explanation:
Given: Kinetic energy K.E = 18 J;
Velocity = 3 m/s
Formula: K.E = 1/2 mV²
m = 2 K.E/V²
m = 2(18 Kg.m²/s²)/(3 m/s)²
m = 36 Kg.m²/s²/9 m²/s²
m = 4 Kg