11) a model drag car is being accelerated along its track from rest by a motor with a force of 75 n, but there is a drag force of 30 n due to the track. what is the kinetic energy after 2 m of travel?

The kinetic energy after 2 m is:

90 J

Explanation:

Given that:

Truck is accelerated from rest with force = F₁ = 75 N

Drag force = F₂ = 30 N

Distance = D = 2 m

Sol:

Kinetic energy is defined as the work done required to move a body from rest position to a specific velocity.

We know that work done is equal to the force multiplied by the distance:

Work done = Force x Distance

W = F x D

According to given situation, the above equation becomes:

W = ( F₁ - F₂) x D

W = ( 75 - 30) x 2

W = 90 J

So, the kinetic energy is 90 J.

gets less

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 .