A proton (mass = 1.67 1027 kg, charge = 1.60 1019 C) moves from ...

[Lisaclaire]

A proton (mass = 1.67  1027 kg, charge = 1.60  1019 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 50 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB  VA.
 a. +20 V
  b. 20 V
  c. 27 V
  d. +27 V
  e. 40 V

Question 2

A particle (mass = 6.7  1027 kg, charge = 3.2  1019 C) moves along the positive x axis with a speed of 4.8  105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
 a. 2.0 kN/C
  b. 1.5 kN/C
  c. 1.2 kN/C
  d. 3.5 kN/C
  e. 2.4 kN/C

[lgoldst9]

Answer to Question 1

b

Answer to Question 2

c