Explanation:
we first find acceleration by
V=u +at (v is the final velocity,u the initial velocity,a the acceleration and t the time taken)
v=25 m/s
u=0
t=3.6s
substituting we get
25=0 + a (3.6)
25=3.6a (diving both sides by 3.6 we get)
a=6.94 m/s^2
to find distance we use the equation v^2=u^2 + 2ad
25^2 =0^2 + 2 (6.94)do
625=13.88d (dividing both sides by 13.88 we get );
d=45m
the answer is d because energy cannot be created nor destroyed, only changed
Answer:
What will be the increase in frequency if these waves are reflected = 2979.63Hz
Explanation:
The detailed steps and appropriate formula is as shown in the attached file.
D. Light from the sun is reflected off the moon's surface
Answer:
Instantaneous speed means speed at any instant
that means Speed is changing with time
You know speed is distance/time
So that means distance is also changing with time
So we take infinitesimal small distance per infinitesimal small time As we assume speed is constant in infinitesimal small time dt
So, we take speed = ds/dt
ds = infinitesimal small distance
dt = infinitesimal small time
As its ratio is equal to speed at any instant
Note : We are taking infinitesimal small distance
But :) we are taking infinitesimal small time also
As you know if denominator is small fraction is large So fraction always give large value
So it's not O ( this makes confuse to most of students)
So, thanks
Good question
Keep thinking like this :)
