Would anyone pls me on these questions

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

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?