The sound from a bolt of lightening travelled 4.08 km in 12.0 s. What was the speed of sound in meters per second. Select one: O a. 0.340 m/s O b. 340 m/s O c. 49.0 m/s O d. 343 m/s Check Starting from rest, an object rolls down a long ramp with a constant acceleration of 1.72 m/s2. After rolling for 4.47 s, what is the magnitude of the ball's final velocity ? Select one: O A. 9.81 m/s O B. 7.69 m/s O C. 6.30 m/s O D. 4.09 m/s Check A baseball flew 19.6m straight into the air after being hit by a bat. How long will it take for the ball to return from its maximum height ? Select one: O A. 1.02 s O B. 3.99 s O C. 1.91 s O D. 2.00 s Check A vehicle is travelling 1.0 x 10 km/h. What is the speed of the vehicle in meters per second ? Select one O a. 2.78 m/s O b. 28 m/s O c. 3.6 x 102 m/s O d. 1.0 x 102 m/s Check A half ton truck with a mass of 1875 kg is traveling on a highway. The engine of the truck supplies an applied force of 7600 N, west, to overcome frictional forces of 3200 N, east. Determine the acceleration of the vehicle, let the direction of the applied force be the positive direction. Select one: O A. 2.35 m/s2 [W] O B. 5.76 m/s= [E] O C. 2.35 m/s2 [E] O D. 5.76 m/s2 [W]A 500 kg vehicle experiences a change in momentum of +356 kg.m/s over a time interval of 5.81 s. What is the force on the vehicle during this time ? Select one: O a. +35.6 N O b. +61.3 N O c. 86.1 N [forward] O d. 29.1 N [forward] Check An 18 wheeler transport truck has a momentum of 8.4 x 105 kg-m/s [N]. If the truck has a velocity of 110 km/h, determine its mass. Select one: O a. 3643 kg O b. 27 491 kg O c. 36 428 kg O d. 2745 kg Check A traffic-safety engineer is designing a deceleration lane. She is basing the length of this lane on the distance needed to slow down form 126 km/h to 65 km/h is 8.0 s. How long should the deceleration lane be ? Select one: O a. 2.1 x 102 m O b. 3.8 x 102 m O c. 4.2 x 102 m O d. 7.6 x 102 m Check A car is travelling 90 km/h at night. A motorist spots a deer on the road 55m in front of the car. If the speed and direction of the car remains the same, how long will it take for the car to reach the deer's position ? Select one: O A. 2.2s O B. 0.62 s O C. 0.80 s O D. 1.6s Check