To avoid using the variable "a" which of the following equations should you use?

a) v² (f) = v² (i) + 2aΔx
b) v (f) = v (i) +at
c) Δx = 1 / 2 ( v (f) + v (i) ) t
d) Δx = v (f) t - 1 / 2 at²

hi im pretty sure these are called 1D kinematic equations! thanks!

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

Aforce is a vector quantity because it has both?