Correct Answer - 2
`s = (t^(3))/(3) - (3t^(2))/(2) + 2t`
`:. V = (ds)/(dt) = t^(2) - 3 t + 2`
Since the particle comes to rest, therefore,
`t^(2) - 3 t + 2 = 0`
`(t - 1) (t - 2) = 0`
` t = 1 s " and " 2s`
Hence, the particle comes to rest twice.
`:. n = 2`