A spring with k = 49 N/m hangs vertically next to a ruler. The end of the spring

Question

A spring with k = 49 N/m hangs vertically next to a ruler. The end of the spring is next to the 17-cmmark on the ruler.

Part A

If a 3.0-kg mass is now attached to the end of the spring, and the mass is allowed to fall, where will the end of the spring line up with the ruler marks when the mass is at its lowest position?

A spring with k = 49 N/m hangs vertically next to a ruler. The end of the spring is next to the 17-cmmark on the ruler.

Part A

If a 3.0-kg mass is now attached to the end of the spring, and the mass is allowed to fall, where will the end of the spring line up with the ruler marks when the mass is at its lowest position?

Explanation / Answer

weight = spring force

mg = kx

x = mg/k

= 3*9.8 / 49

= 0.6 m

= 60 cm

so the scale will be at mark = (60 + 17) = 77 cm

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