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Nataliya [291]
2 years ago
12

An old car has to travel a 2-mile route, uphill and down. Because it is so old, the car can climb the first mile, the ascent, no

faster than an average speed of 15 mi/h. How fast does the car have to travel the second mile, on the descent, to achieve an average speed of 30 mi/h for the trip
Mathematics
1 answer:
Molodets [167]2 years ago
3 0

Answer:

2s + 30 = 2s

Step-by-step explanation:

Time up hill + time down hill = total time

:

Multiply equation by 30s; results

2s + 30 = 2s

:

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IgorLugansk [536]

Answer:

1/4h

Step-by-step explanation:

The car trip is 1/2h shorter than the bus trip.

The bus trip is 3/4h long.

Therefore, the length of the car trip is:

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4 0
3 years ago
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Answer:

The proposed 1600 meters runway length is not long enough

Step-by-step explanation:

The given parameters are;

The amount by which a plane can accelerate = 3.3 m/s²

The time it takes for a plane to lift off the ground = 35 seconds

The length of the runway on the blueprint = 1,600 meters

Therefore, from the equation of motion for distance traveled, s, acceleration, a, and time taken, t, we have;

s = u·t + 1/2·a·t²

Where;

u = The initial velocity

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a = 3.3 m/s²

Given that all planes will start motion from rest, we have;

u = 0 m/s

Therefore;

s = 0 × 35 + 1/2 × 3.3 × 35² = 2021.25 meters

Which indicates that the length of the runway a plane would need for take off should be at least 2021.25 meters long, therefore, the blueprint's 1600 meters runway length is not long enough.

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-3|r+4|=-21 need help for a friend
KonstantinChe [14]
Ans given below

-3r-12=-21
-3r=-21+12
-3r=-9
r=-9\-3
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