Aparticle starts at the origin and moves away from it in a straight line. after 1.6 seconds it is 12.8 meters from the origin. it then reverses direction due to a force field with a like charge. after 3.8 seconds total , the particle is at -9.23 m what is the average velocity of the particle over 3.8 s?

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)