PLZ HELP FOR A QUIZ ASAP!! The force between two charged objects is 64 N. One charge is 1.4 x 10-6 C while the other charge is
1.8 x 10 6 C. What is the distance between these two charges?

A. 1.88 X 102 m
B. 3.54 X 10-4 m
C. 2.82 x 103 m
D. 5.31 x 101 m
E. 1.98 X 107 m

The base of a 50-meter tower is at the origin; the base of a 50-meter tree is at (0, 50, 0). the ground is flat and the z-axis points upward. the following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i) r (t) = (50 + t2)k (ii) r (t) = 2t2 j + 2t2k (iii) r (t) = 50 i + 50 j + (50 − t2)k (iv) r (t) = 2t j + (50 − t2)k (v) r (t) = (50 − 2t) i + 2t j + (50 − t)k (vi) r (t) = t i + t j + tk (a) which projectile is launched from the top of the tower and goes downward? at time t = , the projectile hits the ground at point (x, y, z) = . (b) which projectile hits the top of the tree?