A 6 kg red ball is moving at 4 m/s along the positive x-axis. The red ball elastically collides with a stationary 3 kg blue ball. After the collision, the red ball is traveling 2 m/s at 300° from the x-
axis. What is the magnitude of the blue ball's total final velocity?

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

What is the length x of the side of the triangle below? (hint: use the cosine function)

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?