List of top Physics Questions on potential energy asked in AP EAPCET

An electron is accelerated through a potential difference of 100 V. What is the de Broglie wavelength of the electron? (Assume $ h = 6.626 \times 10^{-34}$  J·s , $ m_e = 9.1 \times 10^{-31}$  $\text{kg} $, $ e = 1.6 \times 10^{-19}$ $\,$ $\text{C} $.)

The potential difference across the ends of a conductor is $ (50 \pm 3) $ V and the current through it is $ (5 \pm 0.1) $ A. The percentage error in the measurement of the resistance of the conductor is: Options:
A block of mass m is connected to one end of a spring of spring constant k. The other end of the spring is fixed to a rigid support. Tile mass is released slowly so that the total energy of the system is then constituted by only the potential energy, then d is the maximum extension of the spring. Instead, if the mass is released suddenly from the same initial position, the maximum extension of the spring now is (g = acceleration due to gravity)