1.

The displacement of a particle starting from rest (at `t = 0)` is given by `s = 6t^(2) - t^(3)`. The time in seconds at which the particle will attain zero velocity again, isA. 2B. 4C. 6D. 8

Answer» Correct Answer - B
Displacement of the particle
`s = 6t^(2)-t^(3)`
Velocity of the particle
`upsilon=(ds)/(dt)=(d)/(dt)(6t^(2)-t^(3))`
`upsilon=12t-3t^(2)`
For `upsilon = 0 rArr 12t=3t^() rArr t=4s`


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