A particle moves in a straight line with velocity v=(16+6t−t2) m s−1v=(16+6t-t^2)\text{ m s}^{-1}v=(16+6t−t2) m s−1 at time t t\,t seconds, where t≥0t\geq0t≥0.
Find the magnitude of the acceleration when the particle is first instantaneously at rest.
Find the total distance travelled during the first 5 seconds.