Mathematics, 14.07.2019 08:00 magicallyhello

Carrie and brent leave home at the same time. carrie drives due east at a rate of 30 mph, while brent drives due south at a rate of 60 mph. how far apart are they (to the nearest mile) after 4 hours.

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Answer from: aubreystechschu11331

They are 268 miles far apart after 4 hoursFurther explanation

Acceleration is rate of change of velocity.

$\large {\boxed {a = \frac{v - u}{t} } }$

$\large {\boxed {d = \frac{v + u}{2}~t } }$

a = acceleration ( m/s² )

v = final velocity ( m/s )

u = initial velocity ( m/s )

t = time taken ( s )

d = distance ( m )

Let us now tackle the problem !

Given :

v₁ = 30 mph due east

v₂ = 60 mph due south

t = 4 hours

Unknown :

displacement = d = ?

Solution :

$d_1 = v_1 \times t$

$d_1 = 30 ~ mph \times 4 ~ h$

$d_1 = \boxed {120 ~ miles}$

$d_2 = v_2 \times t$

$d_2 = 60 ~ mph \times 4 ~ h$

$d_2 = \boxed {240 ~ miles}$

d^2 = (d_1)^2 + (d_2)^2

d^2 = 120^2 + 240^2

d^2 = 72000

$d = \sqrt{72000}$

$d = 120\sqrt{5} ~ miles$

$d \approx \boxed {268 ~ miles}$

Conclusion :They are 268 miles far apart after 4 hoursLearn moreVelocity of Runner : Kinetic Energy : Acceleration : The Speed of Car : Answer details

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate

Carrie and brent leave home at the same time. carrie drives due east at a rate of 30 mph, while bren

Answer from: schnefai000

The Carrie and Brent are $\boxed{268{\text{ miles}}}$ apart from each other after 4 hours.

Further explanation:

The relationship between speed, distance and time can be expressed as follows,

$\boxed{{\text{Speed}} = \frac{{{\text{Distance}}}}{{{\text{Time}}}}}$

Given:

Carrie drives due east at a rate of $30{\text{ miles/hour}}.$

Brent drives due south at a rate of $60{\text{ miles/hour}}.$

Explanation:

Consider the distance covered by the Carrie as ${d_c}.$

The distance covered by the Carrie can be obtained as follows,

$\begin{aligned}30&= \frac{{{d_c}}}{4}\\{d_c} &= 4 \times 30\\{d_c}&= 120{\text{ miles}}\\\end{aligned}$

Consider the distance covered by the Brent as ${d_b}.$

The distance covered by the Brent can be obtained as follows,

$\begin{aligned}60&= \frac{{{d_b}}}{4} \hfill\\{d_b} &= 4 \times 60 \hfill\\{d_b} &= 240{\text{ miles}} \hfill\\\end{aligned}$

The Carrie and Brent are $\boxed{268{\text{ miles}}}$ apart from each other after 4 hours.

Learn more:

Learn more about inverse of the function . Learn more about equation of circle . Learn more about range and domain of the function

Answer details:

Grade: High School

Subject: Mathematics

Chapter: Speed

Keywords: Carrie, Brent, leave, same time, time, leave home, Carrie drives, east, rate, 30 mph, south, drive to south, 4 hours, 60 mph, far, apart,

Answer from: Quest

part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.

Answer from: Quest

The answer is d, none of above hope i

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