Lecture 5 Post

# Lecture 5 Post - Lecture 5 Wednesday 31 August 2011 Chapter...

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Lecture 5 Wednesday 31 August 2011 Chapter 2: Motion along a straight line (cont’d) Constant acceleration along the x -axis Vertical free-fall motion along the y -axis

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How long does it take after the brakes are applied before the car comes to a stop? 1. 2.0 s 2. 4.0 s 3. 6.0 s 4. 8.0 s A car is moving in a straight line towards the positive x -axis with initial speed 30 m/s. The brakes are applied and the acceleration of the car is a x = ! 5.0 m/s 2 . Question Solution Here we use the constant acceleration expression for the velocity v x = v 0 x + a x t . Solve for t to get t = v x ! v 0 x a x = 0 ! (30 m/s) ! 5.0 m/s 2 = 6.0 s . !
How far does the car go after the brakes are applied before the car comes to a stop? 1. 90 m 2. 120 m 3. 150 m 4. 180 m A car is moving in a straight line towards the positive x -axis with initial speed 30 m/s. The brakes are applied and the acceleration of the car is then a x = ! 5.0 m/s 2 . Example

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Lecture 5 Post - Lecture 5 Wednesday 31 August 2011 Chapter...

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