Answer:
Newton's first law.
Explanation:
The first law, in which an object moves forward in a straight line unless acted on by an outside force. It describes Inertia it the inherent property of the body due to which it opposes any change in its state of motion or rest. So due to Inertia, Tasha's brother's body moved forward.
All you need is to locate an artery. theres one by your neck, on the the far sides of your wrists, between your thighs, or you could just feel your own heart.