Two electric charges QA = + 1.0 C and QB= - 2.0 C are located ...

[lak]

Two electric charges QA = + 1.0 C and QB= - 2.0 C are located 0.50 m apart. How much work is needed to move the charges apart and double the distance between them?
 
  A)
 
  -36  10-3J
  B)
 
  +18  10-3
  C)
 
  0
  D)
 
  +36  10-3
  E)
 
  -18  10-3

Question 2

A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2 above the horizontal.
 
  (a) Determine the time necessary for the projectile to reach its maximum height.
  (b) Determine the maximum height reached by the projectile.
  (c) Determine the horizontal and vertical components of the velocity vector at the maximum height.
  (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.

[potomatos]

Answer to Question 1

B

Answer to Question 2

(a) 3.73 s
(b) 68.3 m
(c) vhorizontal = 41.8 m/s, vvertical = 0
(d) ahorizontal = 0, avertical = -9.8 m/s2

[lak]

Both answers were spot on, thank you once again

[potomatos]

Great! Please up vote