Velocity and Acceleration Calculations for a Slowing Truck | Homework Help

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Homework Help Overview

The discussion revolves around kinematics, specifically focusing on velocity and acceleration calculations for a truck and a jet plane. The original poster presents a problem involving a truck that slows down over a distance and time, seeking to determine its initial speed and acceleration. Another participant introduces a related problem concerning a jet plane landing and its stopping distance.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • The original poster attempts to apply a kinematic equation but expresses confusion. Other participants suggest straightforward applications of kinematic formulas for both the truck and the jet plane scenarios, indicating a progression in reasoning.

Discussion Status

The conversation has seen some participants successfully solve their problems, while others are still seeking assistance. There is a mix of exploration and clarification of concepts, with some guidance provided on how to approach the calculations.

Contextual Notes

Participants are working within the constraints of homework assignments, which may limit the information they can share or the methods they can use. The original poster's confusion highlights potential assumptions or misunderstandings about the kinematic equations involved.

BunDa4Th
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I been stuck on this homework problem for about an hour.

A truck covers 40.0 m in 8.25 s while smoothly slowing down to final speed of 2.05 m/s.

(a) Find the truck's original speed.
m/s

(b) Find its acceleration.
m/s2

I was told to use this V^2 = Vo^2 + 2AdeltaX but became lost.
 
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Okay, I finally just figure out how to do this and got the answer

a. 7.65m/s and b. -.70

A jet plane lands with a speed of 117 m/s and can accelerate at a maximum rate of -5.80 m/s2 as it comes to rest.

(a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?
s
(b) Can this plane land on a small tropical island airport where the runway is 0.800 km long?
yes
no
What is the actual minimum distance needed to stop the plane?
km

Can anyone help me with that?
 
a) just requires a straight application of v=v_0 +a t

b) after solving part a, you'll have the time, use that along with velocities (initial and final) in another common kinematics equation, and solve for distance. Then you'll know if .8km is long enough AND you'll have the answer for the 2nd part of b.
 
Thanks for the help and I was able to solve this.
 

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