A59 g arrow is shot straight up into the air with a speed of 25 m/s. it reaches a maximum height of 30.8878 m. find the initial kinetic energy. the acceleration of gravity is 9.8 m/s 2 . answer in units of j.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.