Physics, 31.07.2019 04:30 genyjoannerubiera

Acar traveling at 24 m/s starts to decelerate steadily. it comes to a complete stop in 7 seconds. what is its acceleration?

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- 3.43 m/s^2

Explanation:

1) Acceleration = [change in speed] / [time elpased]

2) Change in speed = final speed - initial speed

Since the car comes to a complete stop, the final speed is 0

3) time = 7 seconds

4) Calculation:

acceleration = [ 0 m/s - 24 m/s] / 7 s = - 24 m/s / 7 s = - 3.43 m/s/s or - 3.43 m/s^2

The negative sign means that the car decelerated.

Answer from: Quest

i think they are all correct

explanation:

they seem good

Check if answers are correcti will mark as the brainliest answer

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Acar traveling at 24 m/s starts to decelerate steadily. it comes to a complete stop in 7 seconds. wh...