A 4.0Kg box is at rest on a table. The static friction coefficient Us between the box and table is 0.30,and the kinetic friction coefficient Uk is 0.10. Then, a 25N horizontal force is applied to the box.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?

Work = force × a. work b. energy c. distance d. momentum