What is 1/2 / 1/4. Please help am getting two answers. idk the correct one.

Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped