Kinematics Equations Video Lessons

Video Thumbnail

Concept

Problem: A car traveling 56.0 km/h is 24.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.00 s later.(a) What is the magnitude of the car’s constant acceleration before impact?(b) How fast is the car traveling at impact?

FREE Expert Solution
96% (408 ratings)
FREE Expert Solution

In this problem, we are required to calculate the constant acceleration and velocity before impact. 

This is a Kinematics problem since it involves initial velocity, v0, acceleration, a, distance covered Δx, and time, t

We'll follow the following simple steps!

  1. Identify the target variable, knowns, and Unknowns for each part of the problem—remember that only 3 of the 5 variables (Δx, v0, vf, a, and t) are needed to solve any kinematics problem.
  2. Choose a UAM equation with only one unknown, which should be our target variable.
  3. Solve the equation for the target variable, then substitute known values and calculate the answer.

We need to remember the four kinematic equations in order to solve the problem. These are:

vf=v0+atΔx=(vf+v02)tΔx=v0t+12at2vf2=v02+2aΔx

96% (408 ratings)
View Complete Written Solution
Problem Details

A car traveling 56.0 km/h is 24.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.00 s later.
(a) What is the magnitude of the car’s constant acceleration before impact?
(b) How fast is the car traveling at impact?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kinematics Equations concept. You can view video lessons to learn Kinematics Equations. Or if you need more Kinematics Equations practice, you can also practice Kinematics Equations practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Jerousek's class at UCF.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Fundamentals of Physics - Halliday Calc 10th Edition. You can also practice Fundamentals of Physics - Halliday Calc 10th Edition practice problems.