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An object moves along the x axis according to the equation x = 2.60t2-2.00t + 3.00, where x is in meters and t is in seconds. An object moves along the x axis according to the equation x = 2.60艮-2.00t + 3.00, where x is in meters and t is in seconds. (a) Determine the average speed betweent2.20 s and t-3.90 s 13.86 m/s (b) Determine the instantaneous speed at t-2.20s 12.87 We are given an explicit expression for x as a function of time. Calculus methods can be used to determine the velocity as a function of time. mys Determine the instantaneous speed at t3.90 s 24.36 We are given an explicit expression for x as a function of time. Calculus methods can be used to determine the velocity as a function of time, myvs (c) Determine the average acceleration between t2.20 s and t 3.90 s. 6.76 You appear to have correctly calculated the acceleration using your incorrect values from part (b), m/s (d) Determine the instantaneous acceleration at t2.20 s 6.76 The instantaneous acceleration is equal to the average acceleration in this case, but your value for the average acceleration is incorrect. m/s2 Determine th instantaneous acceleration at t-3.90 s. 6.76 The instantaneous acceleration is equal to the average acceleration in this case, but your value for the average acceleration is incorrect. m/s (e) At what time is the object at rest? 0.299 The instantaneous velocity will be zero when the object is at rest. Take the derivative of x(t) to find v(t). s


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