Calculate the velocity (in m/s) of a 0.398g object that has E k = 22.4 J. ? m/s

Question

Calculate the velocity (in m/s) of a 0.398g object that has Ek = 22.4 J.

? m/s

Determine which of the following pairs of charged particles has the greater electrostatic energy between them: charges of +1 and 2 separated by a distance of d or charges of +2 and 2 separated by a distance of 2d. Select the single best answer of the three listed below.

charges of +1 and 2 separated by a distance of d have greater energy

charges of +2 and 2 separated by a distance of 2d have greater energy

both pairs have equal energy

charges of +1 and 2 separated by a distance of d have greater energy

charges of +2 and 2 separated by a distance of 2d have greater energy

both pairs have equal energy

Explanation / Answer

1)  From Ek =1/2(m*V^2)

here m= mass;

V= velocity;

Ek=   kinetic energy;
So,we get
V = [2Ek/m]

= [2*22.4/0.000398] = 335.51 m/s

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