I need help with calculus problem
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I need help with calculus problem

[From: ] [author: ] [Date: 12-12-04] [Hit: ]
from D(0)=0.SHOW ALL WORK-Start by rewriting the velocity equation in terms of powers,Understand that the velocity function is actually the first derivative of the displacement function...in other words.......
as you drive along the highway,you step hard on the accelerator to pass a truck. Assume that your velocity, v(t) feet per second is given by v(t)=40+5√t, where t is the number of seconds since you started accelerating. Find an equation for D(t), your displacement from starting point, that is, from D(0)=0. How far do you go in the 10 sec it takes to pass the truck
SHOW ALL WORK

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Start by rewriting the velocity equation in terms of powers, which yields:

v(t) = 40 + 5t^(1/2)

Understand that the velocity function is actually the first derivative of the displacement function...in other words...v(t) = D ' (t). Since we want D(t), we need to integrate.

Integral of 40 + 5t^(1/2) --> Integrate

D(t) = 40t + (10/3)t^(3/2) + C

Use D(0) = 0 to solve for C, which yields:

0 = 40(0) + (10/3)(0)^(3/2) + C --> Simplify.

C = 0

Therefore our final equation for D(t) is:

ANSWER: D(t) = 40t + (10/3)t^(3/2)

To answer the second part, "How far do you go in 10 seconds", simply substitute t = 10 and solve for the distance...

D(10) = 40(10) + (10/3)10^(3/2) --> Simplify.

D(10) = 400 + (10/3)[ 10Sqrt(10) ] --> Use a calculator to approximate.

ANSWER: D(10) = 505 feet

Hope that helps!

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to get D(t) take the integral of v(t) equation. Which is V(t)= 40t+10/3(t)^(3/2) + c. To find out what c is put in 0 for t since D(0)=0, therefore c=0 and D(t)=40t+10/3(t)^(3/2), put in 10 seconds for t and you get 505.4 ft
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