Desde lo alto de un edificio de 25m se deja caer libremente un objeto sólido y sin efectos de la fricción del aire. Calcular el tiempo que tarda en llegar al suelo

because growing process had stoped after 4-5 year

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

it is b. absorbs thermal energy

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.