On average, a newborn human's mass is just over 3.0 kg. ... Suppose this baby is placed in a crib hanging from springs with a total spring constant of 2.60 102 N/m. ... A double coconut can grow for 10 years and have a mass of 20.0 kg. If a 20.0 kg double coconut oscillates on a spring 42.7 times each minute, what is the ...