Review The human head can be considered as a 3.3-kg cranium protecting a 1.5-kg brain, with a small amount of cerebrospinal fluid that allows the brain to move a little bit inside the cranium. Suppose a cranium at rest is subjected to a force of 3000 N for 6.0 ms in the forward direction. Part A What is the final speed of the cranium? Express your answer to two significant figures and include appropriate units. Value Units Submit Request Answer Part B The back of the cranium then collides with the back of the brain, which is still at rest, and the two move together. What is their final speed? Express your answer to two significant figures and include appropriate units. Value Units Submit Request Answer Part C The cranium now hits an external object and suddenly comes to rest, but the brain continues to move forward. If the front of the brain interacts with the front of the cranium over a period of 18 ms before coming to rest, what average force is exerted on the brain by the cranium? Express your answer to two significant figures and include appropriate units. ? Value Units Submit Request Answer Provide Feedback Next >