2. A 5 kg block moves with a constant speed of 10m/s to the right on a smooth surface where frictional forces are
considered to be negligible. It passes through a 2.0 m rough section of the surface where friction is not negligible,
and the coefficient of kinetic friction between the block and the rough section 4, is 0.2. What is the change in the
kinetic energy of the block as it passes through the rough section?
A. 20 J of energy is removed from the block.
C. 250 J of energy is removed from the block.
B. 20 J of energy is added to the block.
D. 250 J of energy is added to the block.

(science)study the following ocean currents map. an ocean currents map is shown. on the map the locations for san diego, california and savannah, georgia are marked. there is a looping current from the north past san diego and a looping current from the south near savannah which statement is most likely correct about the average temperatures in san diego, california as compared to savannah, georgia? it is higher in savannah because of the cool ocean currents from the south. it is higher in savannah because of the warm ocean currents from the north. it is lower in san diego because of the warm ocean currents from the south. it is lower in san diego because of the cool ocean currents from the north.

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?

Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.