O texto sobre o paraquedista informa que a subida da cápsula impulsionada por um balão aerostático durou aproximadamente 2 horas. Sabendo-se que a altitude máxima atingida foi 39 km, determine a velocidade média de subida do balão?

Identify the type of synthetic material used in each object

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm