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Technically, it's a wedge choice letter D.
Answer:
The magnitude of the acceleration ae of the earth due to the gravitational pull of the moon is
Explanation:
By Newton's gravitational law, the magnitude of the gravitational force between two objects is:
(1)
With G the gravitational constant, M the mass of earth, m the mass of the moon and r the distance between the moon and the earth, a quick search on physics books or internet websites give us the values:




Using those values on (1)


Now, by Newton's second Law we can find the acceleration of earth ae due moon's pull:

a) gia tốc = vf-vi / t
a = 14-10 / 20
a = 0,2ms⁻²
b) dưới dạng a = Δv / t
v = lúc
v = 0,2 × 40
v = 8ms⁻¹
như v = d / t
do đó d = vt
d = 8 × 40
d = 320m
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