Need help finding the gravitation constant with masses 55.3 kg,52.2 kg,3.5m distance and 1.56x10^-8 force

Amachine, modeled as a simple spring-mass system, oscillates in simple harmonic motion. its acceleration is measured to have an amplitude of 5,000 mm/s with a fre- quency of 10 hz. compute the maximum displacement the machine undergoes during this oscillation.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.