3. Una bala es disparada verticalmente hacia arri- ba con una velocidad de 90 m/s, determina: a)
¿a qué altura se encuentra con respecto al pun-
to donde fue lanzada a los tres segundos?, b)
¿qué altura máxima alcanza?, c) ¿qué tiempo
tarda en alcanzar la altura máxima?, d) ¿cuál es
el tiempo que dura bala en el aire?, e) ¿qué
velocidad tiene un instante antes de tocar el
suelo?

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

Rain is pulled by gravity which is a non contact force

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction