Question

14.3 pts D Question 5 A drag racer starts from rest and covers 400. m in 4.43 s. Find the acceleration. 10.2 m/s2 20.4 m/s2 1.6 m/s2 40.8 m/s2 Next Previous new data to save. Last checked at 1:19pm Submit Quiz

Answer 1

Racer starts from rest u = 0 m/s distance covered = 400m time taken = 4.43 s from IInd equation of motion s = ut + 1/2 at^2 400 = 0 times t + 1/2 times a times (4.43)^2 400 = 9/2 times (4.43)^2 a = 800/(4.43)^2 = 800/19.625 = 40.76 m/s^2 option (D) is correct starts from 0 reached p. take east along n - axis north along y - axis distance travelled along n - Axis is = 45 sin 30 degree = 45 times 1/2 = 22.5 m distance travelled along y-axis = 35m + 45 cos 30 degree = 35 + 45 times 0.936 77.12 m therefore net distance = squareroot (d_n)^2 + (d_y)^2 = squareroot (22.5)^2 + (77.12)^2 = 80.33 almostequalto 81m option (D) is correct.