if u have guts(physics lovers).Solve this problem created by a 9th class student.?

Question

a circular body initially at rest is moving on an inclined body inclined at an angle '0' (teta).
it follows a motion such that dv=3dt (differentiation) at time 3s.
given coefficient of friction is U. then find the radius and the angular velocity for the body.also find the number of rotations it takes from 3s to 4s.

Feel shame if u cant solve this b'coz this question is created by a 9th grade student for 11 and 12 class students





if u give up saying are shameless,then i will say the answer

hey you!
you got angular velocity as 9.thats true
we know that v=rw(w-angular velocity,v-linear velocity,r-radius)
i also gave dv= 3dt at t=3
integrate it we get
v-u = 3t
u=o=initially velocty
that implies v= 3.3=9m/s
v=rw
9=r9
r=1m

also number of rotations in time 3 s to 4s is number of rotations at 4s - number of rotaions at t=3s

radial acceleration=v^2/r=81m/s
distance at t =4 is
1/2 81 16=648
distance at t =3 is
365.4
=282.6m

number of rotations is

w=w0 + at(alpha t)
w= 0 + 3(3)
w=9

Answer 1

Given acc=dv/dt =3
T=3sec
w x r=n rev/sec =9=acc x t
r=V/W
F=W/2pi
U =tan theta
This is a wheel of a car rolling down the Hill.

Answer 2

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Answer 3

You don't know R and you CANNOT calculate it from the data given.
The only thing that can be calculated here is that v = 9 m/s at t = 3 sec. w = v/r = 9/r.
You have to ASSUME w = 9 in order to conclude that r = 1.

Sounds like 9th grade science to me...........

Answer 4

i am not sure about this but i tried-
radius=147/44
angular velocity=9
number of rotation=21
i dont know if it is correct or not because i am only in tenth
i am sorry if its wrong