Physics, 15.07.2019 15:00 rasv3491

Answer for how to find average velocity and average acceleration based on graph

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Answer from: belle345

There's no information to describe the DIRECTION of the motion
at any time, so I'll have to work with speed instead of velocity.

Average speed = (total distance covered) / (time to cover the distance)

Distance covered in the first 8 seconds = 60 meters)
Distance covered in the middle 16 seconds = 240 meters
Distance covered in the last 21 seconds = 157.5 meters

Total distance covered = 457.5 meters
Time to cover the distance = 45 seconds

Average speed = (457.5 meters) / (45 seconds) = 10.17 m/s .

Average acceleration = (change in speed) / (time for the change)

Speed at the beginning = 0
Speed at the end = 0
Change in speed = 0
Time for the change = 45 seconds

Average acceleration = 0/45 = 0 .

Answer from: Quest

B) raising the temperature and reducing the volume of the gas.|-/

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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