One astronaut on the Moon has a spring with a known spring constant k while another astronaut has simply a string of known length l. An interesting rock is found. Describe how the astronaut with spring can determine the mass of the rock from observations and data secured with the spring without knowing the magnitude of the acceleration due to gravity on the Moon. Is it possible for the astronaut with the string to check the result? Explain how or why not.

One astronaut on the Moon has a spring with a known spring constant k while another astronaut has simply a string of known length l. An interesting rock is found. Describe how the astronaut with spring can determine the mass of the rock from observations and data secured with the spring without knowing the magnitude of the acceleration due to gravity on the Moon. Is it possible for the astronaut with the string to check the result? Explain how or why not.