You go sledding down a very hill close to a major highway. At the bottom of the hill is a smaller hill (5 meters tall) acting as a barrier to the highway. You get a running start of 4 m/s. Use a mass of 1 kg. How high up the hill can you start without going over the smaller hill into traffic?

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.