Kinematics Acceleration physics homework

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SUMMARY

The discussion centers on solving a kinematics problem involving a motorist who decelerates uniformly at 7.0 m/s² over 2.0 seconds. The initial speed of the car can be calculated using the equation v = u + at, resulting in an initial speed of 14.0 m/s. The distance traveled during braking is determined using the equation s = ut + 0.5at², yielding a distance of 14.0 meters. Additionally, considering a reaction time of 7.0 seconds, the total stopping distance amounts to 105.0 meters.

PREREQUISITES
  • Understanding of kinematic equations, specifically v = u + at and s = ut + 0.5at²
  • Knowledge of uniform acceleration and deceleration concepts
  • Familiarity with basic physics principles related to motion
  • Ability to perform calculations involving speed, distance, and time
NEXT STEPS
  • Study the derivation and applications of kinematic equations in various scenarios
  • Explore real-world examples of deceleration and stopping distances in automotive safety
  • Learn about the effects of reaction time on stopping distances in emergency situations
  • Investigate the relationship between speed, braking force, and stopping distance in physics
USEFUL FOR

Students studying physics, particularly those focusing on kinematics, as well as educators looking for practical examples of motion and deceleration concepts.

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Physics help - I know that this qn may be easy but pls help!?

Homework Statement


A motorist was driving along a level road at a steady speed. He had to brake as quickly as possible to avoid a collision. The motorcycle decelerated uniformly at 7.0m/s2 and stopped in 2.0s.

a) At what speed was the car traveling before the breakes were applied?
b) How far did the car travel during braking?
c) If the driver took 7.0s between seeing the child and starting to brake, what was the total stopping distance of the car?
 
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Any ideeas? equations? notes? bit of elbow grease? :P
 


You will need to state some of the related equations. What equations have you learned related to kinematics that you think you can use in this problem?
 

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