Question

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Answer 1

I got 20 N ,not 200N like you, I don't know why

Answer 2

i'm getting 40 N West

Answer 3

explain me, please. @Euler271

Answer 4

F = ma

F_A = 80 N
F_B = 120 N

sum of forces on B = F_B

F_B = 80 + F = 120

F = 40 N

Answer 5

oh yea!! you are right, hahah. I don't know why my 20*4 =100 hehehe. my bad

Answer 6

lol its cool

Answer 7

hahaha, it's not cool, it's stupid. hehehe

Answer 8

nope, Euler is right, \[F_B = m_b a_b = 120 and it is the total force on B while it is under force A = 80, therefore, the unknown force is 120 - 80 =40, not add