What is the formula of Kinetic Energy

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

Photons with the highest energy have the longest period

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency