A mass hung from a spring vibrates 15 times in 12 seconds. Calculate the frequency the period of the vibration

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.