a ball of mass 1000g from a height of 5m and rebounded to a height of 45m. calculate the kinetic energy just before the impact and its initial rebound velocity

The gravitational attraction between two objects will if one object acquires more mass .

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

Ain is , is 's of ? 0.62 0.79 1.27 1.50