Solving Car's 2 Braking Times Problem - Physics Help

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Homework Help Overview

The problem involves a car's motion characterized by two distinct phases: an initial acceleration followed by a braking period. The subject area pertains to kinematics, specifically uniform acceleration and deceleration.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster expresses confusion regarding the initial conditions and which accelerations to apply. Some participants inquire about the formulas available for solving the problem, while others suggest focusing on the distance traveled during the acceleration phase.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the use of kinematic equations, but no consensus has been reached on the overall approach to finding the distance.

Contextual Notes

The original poster indicates a lack of clarity about the initial time and acceleration values, which may affect their understanding of the problem setup.

phipps66
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Ok i have this problem and i have having trouble with it. It reads:

A car starts from rest and travels for 5.0 seconds with a uniform acceleration of +1.5m/s^2. the driver then applies the brakes, causing a uniform acceleration of -2.0m/s^2. If the brakes are applied for 3.0 seconds find: how fast the car is going at the end of the braking period, and how far it has gone

i am confused as which is the initial time and the acceleration to use. i am lost, physics is my worst :frown:
 
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ok i figured out the first part of 1.5m/s as how fast the car is going at the end of the braking period. i just can't figure out the distance
 
What formulas do you have?
 
the kinematic equations'
 
Can you figure out the distance that is traveled while the car is accelerating (before braking)?
 

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