1.¿Qué cae primero, una hoja de papel lisa o una que se ha arrugado hasta hacerla una bolita? ¿Por qué? 2.¿Hacia dónde se dirige siempre la aceleración de la gravedad?

me ayudan por favor

Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

In science and physics what is the standard unit of measure for speed?