A collision occurs in a closed system. How often are linear momentum, kinetic energy and total energy conserved? Linear Momentum
Kinetic Energy
Total Energy

A. Always, Always, Always

B. Always, Sometimes, Always

C. Always, Sometimes,
Sometimes

D. Sometimes, Sometimes,
Always

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

answer///scientific method;