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An elevator is moving upward with a speed of 8.3 m/s. 3.6 seconds later, the elevator is still moving upward, but its speed has increased to 19.8 m/s. What is the average acceleration, in m/s , of the elevator during the 3.6-s interval? Please round your answer to one decimal place. Equation: v_v +atAn airplane starts from rest (i.e., its initial velocity is zero) at the end of a runway and accelerates at a constant rate. In the first second (i.e, att = 1.0 s) the airplane travels x = 20 m. What is the distance of the airplane at the end of 2 seconds? Please round your answer to the nearest whole number (integer). Equation: = vat+ -at2An object moves horizontally with a constant acceleration of a = 6 m/s. What is the initial velocity of the object if at t = 4 s, the object has moved a distance of x = 869 m? Please round your answer to one decimal place. Equation: x = Vat + zat