20.3 divided by 3.0 will get u velocity and v times 3.0s
Hope this is helpful <span>Weightlessness
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Answer:
F4.0
Explanation:
To obtain a shutter speed of 1/1000 s to avoid any blur motion the f-number should be changed to F4.0 because the light intensity goes up by a factor of 2 when the f-number is decreased by the square root of 2.
13200N
Explanation:
Given parameters:
Mass = 1100kg
Velocity = 24m/s
time = 2s
unknown:
Braking force = ?
Solution:
The braking force is the force needed to stop the car from moving.
Force = ma = 
m is the mass of the car
v is the velocity
t is the time taken
Force = 
= 13200N
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Force brainly.com/question/4033012
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Answer:
Explanation:
by Doppler effect
F apparent = F real x (Vair +- Vobserver) / (Vair +- Vsource)
case1 :if observer is approaching a source then put a + in numerator and - in denominator
case 2 : if observer is going away from source then do opposite.
it is case1 cos observer is moving toward wall . actually wall is acting as a source for observer
so
F apparent = 240 x (344 + vp ) / (344 - vp )
now F apparent - Freal = beat frequency of 6.00 Hz
so {240 x (344 + vp ) / (344 - vp )} - 230 = 6
240 x (344 + vp -344 + vp) / (344 - vp ) = 6
240 x 2 x vp = 6 x (344 - vp )
480 vp = 2064 - 6 x vp
486 x vp = 2064
vp = 4.24 m/s
