Motion in A Straight Line

Question: The position \[x\] of a particle varies with time \[t\] as \[x = a{t^2} - b{t^3}\]. The acceleration of the particle will be zero at time \[t\] equal to



1) \[\frac{a}{b}\]
2) \[7.5\;km/h\]
3) \[\frac{a}{{3b}}\]
4) Zero
Solution: Explanation: Explanation
non-uniform-motion

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