When the forces acting on an object are , the net force must be zero.

According to Newton's first law, when the net force acting on an object is zero, the object must __have a velocity of zero___.

Explanation:

When the net force is zero, the acceleration is zero, so the velocity must be constant. Note that zero velocity is simply a special case of constant velocity.

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MARK BRAINLIEST!

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 .