Cu o rangă se încearcă ridicarea unui dulap ce are masa de 60 kg. Știind că ranga are 1,2m lungime și că este sprijinită la 20 cm de un capăt , aflați forța cu care trebuie apăsat pe celălalt capăt pentru a o echilibra. Ce tip de pârghie este?

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

i would say

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it