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rjkz [21]
2 years ago
9

The driver of a car travelling downhill on a road applies the brakes. The speed s

Mathematics
1 answer:
Pepsi [2]2 years ago
3 0

The maximum speed reached is 89 km/h after 1.5 seconds.

<h3>Speed</h3>

Given the speed s of the car in km/h, t seconds after the brakes were applied.

s(t) = -4t² + 12t + 80

a) The brakes were applied at t = 0, hence:

  • s(0) = -4(0)² + 12(0) + 80 = 80 km/h

b) At s = 88:

88 = -4t² + 12t + 80

t = 2 seconds and t = 1 second

c) The maximum speed is at s'(t) = 0

s'(t) = -8 t + 12 = 0

8t = 12

t = 1.5 seconds

s(1.5) = -4(1.5)² + 12(1.5) + 80 = 89 km/h

The maximum speed reached is 89 km/h after 1.5 seconds.

Find out more on speed at: brainly.com/question/4931057

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Step-by-step explanation:

From the information given on statement, we know that Paul saves all of his earnings weekly. Then, the money save is equal to the sum of initial amount (C_{o}), measured in monetary units, and week earning (R), measured in monetary units, multiplied by a number of weeks (n), dimensionless:

C =C_{o} + n\cdot R (1)

Now we clear the number of weeks within the formula:

n = \frac{C-C_{o}}{R}

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You have conducted a survey on a number of households and found out how many pets they owned brainly
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Step-by-step explanation:

Missing information;

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0                              IIII             4

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∠ U = 22.62°

Step-by-step explanation:

We can use the trigonometric expression to find ∠U by using the ratio:

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