Which of the following best describes the current age of the Sun? A.) It is near the end of its lifespan.

B.) It is about halfway through its lifespan.

C.) It is early in its lifespan.

D.) We do not have a good understanding of the Sun's age.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Which of the following is an example of units for speed

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.