Nine-year-old Chen refuses to sleep in her own room after her parents' divorce. Instead, she climbs into her mother's bed each night and refuses to leave. Chen's behavior is an example of what ego defense mechanism

regression

Explanation:

regression defense mechanism is the one in which the ego of a person reverts back to earlier stages of development forming a retreat and this happens in the case of sheer stress and distressing situations.

a. formula: f=ma or f/m=a

10,000n/1,267kg≈7.9m/

b. formula: a= and s=d/t

speed= 394.6/15

s=26.3m/s

a=

a=1.75m/

c. 7.9-1.75=difference of 6.15m/

d. the force that most likely caused this difference is friction forces

i'll just take the points xd