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3 years ago

A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?

Mathematics

1 answer:

Shalnov [3]3 years ago

8 0

Answer:

D. 150 metres

Step-by-step explanation:

speed = (60) times 5/18 = 50/3

lenght of the train = (speed x time)

lenght = 50/3 times (9)

= 150 m.

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2 years ago

Y is inversely proportional to x and y = 24 when x = 2.

bija089 [108]

Answer:

k = 48

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Step-by-step explanation:

The general equation for inverse variation is

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A bus travelled from location A to location B in 90 minutes. Calculate the speed of the bus in km/h

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2 years ago

A volleyball reaches its maximum of 13 feet, 3 seconds after it is served. What quadratic formula could model the height of the

Katena32 [7]

Answer:

$H=-(t-3)^2+13$

Step-by-step explanation:

The path covered by the volleyball will be a downward parabola with the vertex being the highest point of the ball.

A general form of a downward parabola is given as:

$y=-a(x-h)^2+k$

Where $(h,k)$ is the vertex of the parabola and 'a' is a constant.

Now, let 'h' be the vertical height and 't' be the time taken.

So, the equation would be of the form:

$H=-a(t-h)^2+k$

Now, as per question:

h = 2 seconds, k = 13 feet.

$H=-a(t-3)^2+13$

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$H=-(t-3)^2+13$

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3 years ago