Context for question 3A particle P travels in a straight line, starting from a point O. At time t seconds the displacement of P from O is s metres, where s=4t3−39t2+120t.
3(a)Kinematics Variable AccelerationMedium3 marksFind the values of t for which P is instantaneously at rest.WorkingTypeWriteMath0 wordsValues of tTypeWriteMath0 wordsGrade answerSolutionGrading criteria
3(b)Kinematics Variable AccelerationMedium2 marksFind the total distance travelled by P in the interval 1≤t≤4.Total distancemGrade answerSolutionGrading criteria
3(c)Kinematics Variable AccelerationMedium3 marksFind the magnitude of the acceleration of P when t=3.WorkingTypeWriteMath0 wordsMagnitude of accelerationm/s2Grade answerSolutionGrading criteria