Why are seat belts important and how do they to Newton's law of motion?

If seatbelts are not used, there is a high risk of injury if you were to get into a wreck because if there is no force acting on your body then you will continue moving even after the car has stopped. Newton's first law of motion states that an object will remain at rest unless compelled to change its state by the action of an external force. This law is also referred to as the law of inertia.

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total distance/total time

(85 + 82)/(5+3)

167/8

20 just over

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.