2. What does negative velocity mean? O Velocity has been infused with negative ions
O The acceleration is positive but in the wrong direction
O The velocity of the object while it is returning to its starting point
O Motion that is negative

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.