Question

An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?

Name: Problem 33, Chapter 2: College Physics for AP® Courses
Uploaded: 2020-03-11T19:24:26-08:00
Duration: 1 min 15 s
Channel: Caitlin Walker
Description: An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?

   An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?

College Physics for AP® Courses

Irina Lyublinskaya,…

Chapter 2, Problem 33

Instant Answer

Solved by Expert Caitlin Walker

03/11/2020

Step 1

The equation is given by: \[v_f^2 = v_i^2 + 2a\Delta x\] where \(v_f\) is the final velocity, \(v_i\) is the initial velocity, \(a\) is the acceleration (which is what we're trying to find), and \(\Delta x\) is the displacement. Show more…

Show all steps

Thanks for your feedback!

An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?

Play audio

Feedback

Caitlin Walker and 55 other subject Physics 101 Mechanics educators are ready to help you.

Ask a new question

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Time Interval Calculation

This involves determining the duration over which the change in motion occurs, typically by isolating the time variable in the kinematic equations once the other quantities, such as displacement and acceleration, have been determined.

Kinematic Equations

These are mathematical formulas that relate the initial velocity, final velocity, acceleration, displacement, and time of an object's motion under constant acceleration. They are critical in solving problems involving uniform motion changes.

Constant Acceleration

This concept refers to situations where the acceleration does not change over the period of motion, allowing for the use of specific kinematic equations to relate displacement, velocity, acceleration, and time.

Deceleration

Deceleration is essentially negative acceleration, representing a reduction in the magnitude of velocity. It is computed using the same principles as acceleration but indicates a slowing down of the object.

Please give Ace some feedback