Un muchacho tira una pelota hacia abajo a -25,0 m/s desde la azotea de un edificio de 30,0 m. ¿Qué tiempo tarda la pelota en llegar al suelo y que velocidad final tiene?

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Which transition by an electron will release the greatest amount of energy? oa ob oc od

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration