Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is

C) either depending on her running direction

Explanation:

The following information is given in the question

katelyn runs at 8 m/s

her speed relative to the floor is 3 m/s

Based on the above information

Now her speed relative with respect to an  observe for the rest on the ground would be based on her running direction that means in which direction she is running

Therefore the option c is correct

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 .

conduction, convection, radiation