The distance from the Earth to the Sun is 92.96 million mi.
To solve this problem it is necessary to apply the concepts related to the Period based on the length of its rope and gravity, mathematically it can be expressed as

g = Gravity
L = Length
T = Period
Re-arrange to find the gravity we have

Our values are given as

Replacing we have



Therefore the correct answer is C.
T=s/v=>t=1500/1,5=1000s
1,5km=1500m
Steel materials produce less vibrations whilst less dense and more malleable parts produce more vibrations, e.g. the wooden part of the coaster itself.
B AND C I THINK I TOOK THIS ALREADY MS