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Problem: The head of a rattlesnake can accelerate at 50m/s2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 100km/h from rest?

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For this problem, we're asked to find the time taken by an accelerating object to reach target speed.

When solving problems with uniformly accelerated motion (UAM), Step Zero is making sure that the acceleration is constantotherwise, our kinematics equations don’t apply. Then we'll follow these steps to solve the problem:

  1. Identify the target, known and unknown variables for each part of the problem—remember that only 3 of the 5 variablesx, 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.

The four UAM (kinematics) equations are:

 vf = v0 +atx= (vf+v02)tx= v0t+12at2 vf2= v02 +2ax

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Problem Details

The head of a rattlesnake can accelerate at 50m/s2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 100km/h from rest?

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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 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.