Aspring supporting a mass of 30 kg compresses 0.6 m. how far does the spring compress when it supports a mass of 10 kg?

a. 0.1 m
b. 0.2 m
c. 1.2 m
d. 1.8 m

Applying Hooke's law, F= k|deltax|, spring constant can be estimated using the given,
k = (30 kg)(9.m/s)/0.6
k=490. Upon obtaining the value of the spring constant, the amount by which the 10kg mass would be compressed can be estimated using the same formula,
F=k|deltax|
(10)(9.8)/490 = 0.2 m (option B)

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