Which perspective would study the chemical reactions that occur in the brain

Biological

Explanation:

Biological psychology refers to the application of the principles of biology to the study of mental processes and mechanisms of behaviour in humans and other animals. This area of study overlaps with neuroscience, as biological psychology studies the chemical reactions that take place in the brain. The discipline emerged in the 18th and 19th century.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.