quick! What is the potential energy of stretched spring, if the spring constant is 40 N/m and the elongation is 5 cm?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

At what time will the interfering waves have an amplitudeof zero?