Hint 1 Hint 2 A proton in a synchrotron is moving in a circle of radius 1 km and increasing its speed by v(t) = c1 + Cat, where c1 = 9.4 x 105 m/s and C2 = 105 m/s3. a. What is the proton's total acceleration at t = 5.0 s? a = x 109 m/s2 b. At what time does the expression for the velocity become unphysical? t = Question Help: Message instructor Submit