Sabiendo que la distancia media de la Tierra a la Luna es de 3,84 · 105 km, calcula: a) La fuerza con que se atraen la Tierra y la Luna. b) La aceleración que esa fuerza le comunica a la Luna y a la Tierra. Datos: mTierra = 5,97 · 1024 kg; mLuna = 7,35 · 1022 kg; G = 6,67 · 10-11 N·m2 /kg2

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day