a 60-kilogram high jumper lands on a mat after her jump. the mat brings her to a stop after 1 second. she
was traveling at 5.0 m/sec when she landed on the mat. note: the speed of the jumper at the top of her jump.
before she started to fall toward the mat, was 0 m/sec.
a. what is the change in momentum for the jumper?
b. what is the force felt by the jumper upon impact with the mat?

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =