G a small metal sphere, carrying a net charge is held stationary. what is the speed are 0.4 m apart

The final speed of small metal sphere is 12.6 m/s.

Explanation:

Given that,

Distance = 0.4 m

Suppose, A small metal sphere, carrying a net charge q₁ = −2μC, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q₂ = −8μC and mass 1.50g, is projected toward q₁. When the two spheres are 0.800m apart, q₂ is moving toward q₁ with speed 20m/s.

We need to calculate the final speed of small metal sphere

Using conservation of energy

Put the value into the formula

Hence, The final speed of small metal sphere is 12.6 m/s.

wavelength divides in half and speed stays the same.