Which scenario involves acceleration? a motorcycle at constant speed on a highway a recreational vehicle parked in a campground a car decreasing its speed due to a red light a teenager talking to friends at an intersection

A car decreasing its speed due to a red light is accelerating since there is a change in speed.

Acceleration is the rate of change of speed with respect to time. Acceleration is given by:

Acceleration = change in speed / time

A motorcycle moving at constant speed is not accelerating since there is no change in speed.

A recreational vehicle parked in a campground s not accelerating since there is no change in speed.

A car decreasing its speed due to a red light is accelerating since there is a change in speed.

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a car decreasing its speed due to a red light

Explanation:

Acceleration of an object is defined as the rate of change in velocity of the object:

where

is the change in velocity

is the time elapsed

Therefore, we have a non-zero acceleration every time there is a change in velocity.

Among the examples given, we notice that only the following one:

"a car decreasing its speed due to a red light"

involves a change in velocity (because the car is decreasing its speed), therefore this scenario involves a non-zero acceleration.

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 .

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