Physics, 23.09.2019 16:30 punkinrichard1oxon2i

Arace finishes at the same place as it started. the contestants start from rest and cross the finish line running. which one of the following is true about the average speed, the average velocity, and the average acceleration? note that the symbol â‰ means "not equal to".
which one?
a. average speed = 0 m/s, average velocity â‰ 0 m/s, average acceleration = 0 m/s2
b. average speed â‰ 0 m/s, average velocity = 0 m/s, average acceleration â‰ 0 m/s2
c. average speed = 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2
d. average speed â‰ 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2
e. average speed â‰ 0 m/s, average velocity â‰ 0 m/s, average acceleration =0m/s^2

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Answer from: scarbroughmary0

Explanation:

As we know that

Average velocity= Total displacement/Total time

v=d/t

Average speed= Total distance/Total time

V=S/T

As we know that average acceleration given as

$a_{avg}=\dfrac{a_1t_1+a_2t_2}{t_1+t_2}$

Starting and finishing point is same for race,that means that it total displacement will be zero but total distance will not be zero.So we cam say that it average velocity will be zero but average speed will not be zero.It average acceleration will not be zero also.

So our option b is correct.

Answer from: Quest

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

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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Arace finishes at the same place as it started. the contestants start from rest and cross the finish...