4. Kevin, Tian dan Tommy mendorong meja seperti

Jawaban:

X = 55 N

Penjelasan:

diketahui:

∑F = (F₁ + F₂) − F₃

= (45 + X ) − 25 = 20 + X

W = 150 Joule

S = 200 cm = 2 m

ditanya: X

jawab:

W = ∑F . S

∑F = W / S

= 150 / 2 = 75 N

∑F = 20 + X

X = ∑F − 20

X = 75 − 20

X = 55 N