HELP PLEASE

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.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Which planet do you think would be easiest for humans to colonize some day?