46 Question 1 A particle moves along the x-axis so that at time t> 0 its position is given by x (t) 2t3 21t + 72t - 53. At what time t is the particle at rest? - O t-7/2 only Ot=4 and t=3 Ot=3 only O t-3 and t=7/2 O t=1 only 5 pts