(a) What is the length of a simple pendulum that oscillates with a period of 1.8 s on Earth, where the acceleration due to gravity is 9.80 m/s2, and on Mars, where the acceleration due to gravity is 3.70 m/s? LE= LM = m ME= mm = m (b) What mass would you need to suspend from a spring with a force constant of 20 N/m in order for the mass-spring system to oscillate with a period of 1.8 s on Earth, where the acceleration due to gravit is 9.80 m/s, and on Mars, where the acceleration due to gravity is 3.70 m/s? kg kg