HURRY PLEASE!! I’ll mark you as brainliest A 75-kg boy, travels at a speed of 20 m/s down the slope as shown. Assuming no frictional loss, what will be his kinetic
energy at the bottom of the slope?

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?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?