Kinematics Equations Video Lessons

Concept

# Problem: A car starts from rest at a red light at t = 0 and accelerates at 2 m/s  2 for 10 s, then travels at constant speed for 10 s, accelerates (decelerates) at -1 m/s2 until it reaches zero velocity and stops.  [a] Plot the velocity of the car versus time from t = 0 s until it stops. [b] Find the average acceleration between t = 0 and t = 20 s. [c] Find the displacement of the car from start to stop. [d] Find the average velocity of the car for the entire trip from start to stop.

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###### Problem Details

A car starts from rest at a red light at t = 0 and accelerates at 2 m/s  for 10 s, then travels at constant speed for 10 s, accelerates (decelerates) at -1 m/s2 until it reaches zero velocity and stops.

[a] Plot the velocity of the car versus time from t = 0 s until it stops.

[b] Find the average acceleration between t = 0 and t = 20 s.

[c] Find the displacement of the car from start to stop.

[d] Find the average velocity of the car for the entire trip from start to stop.