lotion Acceleration Acceleration in One Di 2-1 10 Find the position 2.00 s if the particle is of 20.0 m/s and exper tude 4.00 m/s, direc II An elevator is initia 12.00 m/s. The eleva ward acceleration o (a) Find the magnit final velocity. (b) How far did it 12 A paratrooper is ir of 30.0 m/s befc opens, she experi celeration of 75.0 I A sprinter starts from rest and accelerates to 10.0 m/s in a time interval of 1.00 s. Find the magnitude and direction of the runner's average acceleration ā during 54 .3 anc 2 A girl swims the length of a pool and back in 30.0 s. The pool is 20.0 m long, and the girl's speed is con- this interval. (a) Compute her speed v and her average velocity v. (b) When is her acceleration not equal to zero? 3 A world champion drag racer starts from rest and ac- celerates over a quarter-mile drag strip in 5.80 s. (a) Find the racer's average velocity U, in m/s. (b) The car's speed at the end of the strip is 402 km/h (250 mi/h). Find the average acceleration ā, in m/s?. stant. (a) If this acceler time would b 4 A football player carrying the ball runs straight ahead at the line of scrimmage and directly into a wall of de- fensive linemen. The ball carrier has an initial speed of 8.00 m/s and is stopped in a time interval of 0.200 s. Find the magnitude and direction of his aver- speed to a sa tion is not co of constant a (b) How far doe interval? age acceleration. 5 A baseball player hits a line drive. Just before the ball is struck, it is moving east at a speed of 40.0 m/s (90 mi/h). Just after contact with the bat, 1.00 × 10-3 s later, the ball is moving west at a speed of 50.0 m/s (112 mi/h). Find the ball's average acceleration. 6 A car moves along a straight section of highway. Its speedometer readings at 1.0 s intervals are 50 km/h at 0, 54 km/h at t = 1.0 s, 56 km/h at t = 2.0 s, 13 The brakes are level highway the car's acce speed is 30.0 how far does brakes are ap 14 A human bei t = %3D more than a 70 km/h at t = 3.0 s. ous permane (a) Find the magnitude of the average acceleration ā, in m/s?, over the 3.0 s interval. (b) Estimate the instantaneous acceleration, in m/s², at for more tha acceleration moving at t = 0. collision. 7 At 0.100 s intervals, the x coordinates of a particle are 0, 1.01 cm, 2.05 cm, and 3.12 cm. Estimate the instan- taneous velocity and acceleration at t = 0. 8 A Ferrari F40, the world's fastest production car, can start from rest and achieve an average acceleration of 6.70 m/s² over a 4-second interval. How fast is the car (a) What is must be an acce 102 m/ (b) What allowe moving after 4.00 s? 9 Find the constant acceleration of a particle whose ve- (Air b locity changes by 3 00 çause