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parmer6527p810bw
23.07.2019 •
Mathematics
Can someone with these 3 questions, they are in the pictures!
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Ответ:
y = v - 1/2 g t^2 Subtract v from both sides.
y - v = - 1/2 gt^2 Multiply both sides by - 1
-(y - v) = 1/2gt^2 Remove the brackets.
v - y = 1/2 gt^2 Divide by g
(v - y)/g = 1/2 t^2 Multiply by 2 on both sides
2(v - y)/g = t^2 Move the 2 to the denominator on the left.
(v - y) / 0.5g = t^2 Take the square root of both sides.
sqrt [ (v - y) / 0.5g ] = t
B or second one down <<<<<<<
Question Two
There are no minuses in the answer. That eliminates 2 and 3
km^2 - c = n Add c to both sides.
km^2 = c + n divide both sides by k
m^2 = [c + n]/k Take the square root of m^2
m = sqrt [(c + n)/k]
Answer A or the first one.
Problem 3
This is an estimation question. One value of x is <0 the other > 0
The two graphs cross when x = a bit over 2 and x < about - 5
The answer is C 2.1 and - 5.1 about.
2.1 and -5.1
C <<<<<<<<<
Ответ:
They move towards each other by the speed 28 mph
If the bicyclist is catching the hiker, they get closer by the speed 16 mph
Step-by-step explanation:
Since, when two object are travelling in the opposite direction with the speed of x miles/h and y miles/h
Then, their relative speed = | x + y | miles/ h
While, when they are travelling in the same direction,
Then, their relative speed = | x - y | miles/h
Here, the hiker's rate = 6 miles/ h,
Also, 3/11 of the bicyclist's rate = Hiker's rate
⇒ Bicyclist's rate = 11/3 of Hiker's rate = 11/3 × 6 = 22 miles/h
Hence, When, they move towards each other,
Their relative speed = 22 + 6 = 28 miles/h
While, If the bicyclist is catching the hiker,
That is, they are travelling in same direction,
Their relative speed = 22 - 6 = 15 miles/h