I WILL NAME YOU BRAINIEST PLEASE HELP 5. Law of Conservation of Momentum states that momentum of the system
before the collision is equal to the momentum of the system after the collision
unless an external force acts on the system.
Consider two cars with mass of 1 kg each.
Before the collision: Car A is moving to left right (-10 m/s), Car B is moving to
the right (20 m/s). Be careful with the sign.
After the collision: Car A and Car B are stuck together.
What is the velocity of the two cars after they are stuck together?
A. 5 m/s to the left( v = -5 m/s)
B. O m/s
c. 5 m/s to the right (v = 5 m/s)
D. 10 m/s to the right (v = 10 m/s)

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants