Question

a V 43.3 m/s2 s. This answer agrees with the one obtained above using Equation [1]. Guided Problem A race car starting from rest accelerates at a constant rate of 5.20 m/s?. After how much time has the car traveled 28.5 m along the x-axis? Part 1 of 6 Identify the known and unknown quantities. The car starts from rest so its initial velocity is vo 0. During the time interval of interest, the car travels 28.5 m at constant acceleration along the x-axis, so Δ× 28.5 m. The car's acceleration is constant at a 5.20 m/s2. Therefore, the unknown quantity to be determined is the time t. Part 2 of 6 Identify the equation(s) to be used. Which one of the three constant acceleration equations can be used to solve for the time t? O none of the above Skip (you cannot come back) ADDITIONAL PROBLEMS OHL

Answer 1

Car starts from rest implies u = 0 give acceleration = u = 5.20 m/s^2 distance = x = 20.5m using S = ut + 1/2 at 28.5 = 0(t) + 1/2 (5.2) times t 28.5 times 2/5 middot 2 = t t = 10.96 sec we have to use delta x = V_0 t + 1/2 at^2 to solar for t cause we have no information about final velocity (v) using this equation 28.5 = (0) (t) + 1/2 (5.2) t 28.5 times 2/5.2 = t t = 10.96 sec