Magnitude of acceleration = (change in speed) / (time for the change) .
Change in speed = (end speed) - (start speed)
= (2 m/a) - (8 m/a) = -6 m/a .
Time for the change = (end time) - (start time)
= (13 sec) - (10 sec) = 3 sec .
Magnitude of acceleration = (-6 m/a) / (3 sec)
= -2 m/a per second .
(That's the best I can do with the ambiguous units.
What unit of speed is 'm/a' ? Is that "miles per afternoon" ?)
I think C is the correct answer
Answer:
Explanation:
The original frequency of sound being emitted f₀ = 1800
Its velocity towards the observer v ( let )
Apparent frequency f = 2130
velocity of sound = V
Placing the given values
1.1833 =
1.1833 v = 62.87
v = 53.13 m /s .
b ) In the second case
formula for apparent frequency
Substituting the values
= 2458 Hz .
Answer:
ثر أنواع التربة خصوبة التربحمراء .
ج- السوداء
Explanation:
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