If a particle moves along a line with position function for , at what times is the particle at rest?
Answer and explanation
Correct answer: B.
- Step 1: A particle is at rest when its velocity is zero: .
- Step 2: Compute the velocity function: .
- Step 3: Factor: .
- Step 4: Solve for : .
Answer
.
Why not the others: '' gives the positions where ; ' only' is where acceleration ; ' only' misses the second root.
Practise more Differentiation.
Free questions with an explanation for every one, and full timed AP (Advanced Placement) mock tests.