What is the most important factor in dimoning the weather?

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

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

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.