The answer is A because potential energy is stored up energy which means that it’s not moving
Im not so sure but it should be the
instantaneous speed
Answer:

Explanation:
Given,
mass = 1.41 g = 0.00141 Kg
Electric field,E = 670 N/C.
We know,
Force in charge due to Electric field.
F = E q
And also we know
F = m g
Equating both the equation of motion
m g = E q

Charge of the particle is equal to 
Explanation:
The given data is as follows.
= 120 V,
= 6.50 V
= 400,
= ?
Formula to calculate the number of turns in secondary coil are as follows.

Putting the given values into the above formula as follows.


= 21.66
= 22 (approx)
Thus, we can conclude that number of turns in the secondary coil are 22.
La respuesta es la letra b