# Question 1 1. At time t = 0 s, a puck is sliding on a horizontal table with a velocity 10.0 m/s, 60.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = – 0.5 m/s 2 and ay = – 1.0 m/s 2 . What is the velocity of the puck at time t = 4.0 s?

Question 1 1. At time t = 0 s, a puck is sliding on a horizontal table with a velocity 10.0 m/s, 60.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = – 0.5 m/s 2 and ay = – 1.0 m/s 2 . What is the velocity of the puck at time t = 4.0 s? a. 6.00 m/s, 71.3° above the +x axis b. 1.83 m/s, 62.0° above the +x axis c. 5.54 m/s, 57.2° above the +x axis d. 1.38 m/s, 65.2° above the +x axis e. 4.50 m/s, 58.7° above the +x axis 1 points Save Answer Question 2 1. A car that was initially moving at 30 m/s accelerates in a straightline path at a constant rate. The car travels a distance of 250 m in 5.0 seconds. What is the acceleration of the car? a. 4.0 m/s b. 6.0 m/s c. 10 m/s d. 5.0 m/s e. 8.0 m/s 1 points Save Answer 2 2 2 2 2 Question 3 1. Three runners start at the same place. Shaun runs 6.0 km due east and then runs 2.0 km due west. Mark runs 4.0 km due east. Jeff runs 3.0 km due west and then runs 7.0 km due east. Which of the following is true concerning the displacement of each runner? a. Shaun’s displacement equals Jeff’s displacement, but Mark’s displacement is different b. Shaun, Mark, and Jeff have the same displacements c. Shaun’s displacement equals Mark’s displacement, but Jeff’s displacement is different d. Shaun, Mark, and Jeff have different displacements e. Mark’s displacement equals Jeff’s displacement, but Shaun’s displacement is different 1 points Save Answer Question 4 1. A ball is thrown as a projectile at an angle of 30 . The initial velocity of the ball is 36 m/s. What is the maximum horizontal distance (Range) of the ball? a. 114.5 m b. 88 m c. 97 m d. 126 m e. 78.5 m 1 points Save Answer o Question 5 1. A boat moves 3.0 km due north and then moves 4.0 km due east. The time for this trip is half an hour. What is the average speed of the boat? a. 3.0 km/h b. 5.0 km/h c. 4.0 km/h d. 8.0 km/h e. 10.0 km/h 1 points Save Answer Question 6 1. A car travels due east at 20 m/s. It makes a turn due north and continues to travel at 15 m/s. What is the net velocity of the car? a. zero m/s b. 40 m/s, due south c. 25 m/s, 37° east of north d. 31 m/s, 55° south of west e. 31 m/s, 45° south of west 1 points Save Answer Question 7 1. What constant acceleration would a car, starting from rest, have to sustain in order to reach a velocity of 24 m/s due west in 4.0 s? a. 9.0 m/s 2 , due east b. 1.5 m/s 2 , due east c. 3.0 m/s 2 , due west d. 6.0 m/s 2 , due west e. 4.5 m/s 2 , due east 1 points Save Answer Question 8 1. A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true? a. The xcomponent of the velocity of the ball is constant throughout the ball’s flight b. The velocity of the ball is zero when the ball is at the highest point in the arc c. The acceleration of the ball is zero when the ball is at the highest point in the arc d. The acceleration of the ball decreases as the ball moves upward e. The ycomponent of the velocity of the ball is maximum when the ball is at the highest point 1 points Save Answer Question 9 1. A jogger runs along a straight and level road for a distance of 8.0 km and then runs back to her starting point. The time for this roundtrip is 1.0 h. Which one of the following is true? a. Her average speed is 16.0 km/h, but there is not enough information to determine her average velocity b. Her average speed is 8.0 km/h, and her average velocity is 16 km/h c. Her average speed is 8.0 km/h, and her average velocity is 8.0 km/h d. Her average speed is 8.0 km/h, and her average velocity is 0 km/h e. Her average speed is 16.0 km/h, and her average velocity is 0 km/h 1 points Save Answer Question 10 1. A spacecraft is traveling with a velocity of +3500 m/s. Suddenly the retrorockets are fired, and the spacecraft begins to slow down with an acceleration whose magnitude is −10.0 m/s 2 . How far does the spacecraft travel until it comes to a momentary halt? a. 8.42 x 10 5 m b. 5.28 x 10 5 m c. 9.46 x 10 5 m d. 3.17 x 10 5 m e. 6.13 x10 5 m 1 points Save Answer Question 11 1. Two cars both start from rest and have the same constant acceleration. When radar is used to measure the velocity of each car, car A is found to be moving three times as fast as car B. At the instant the radar is used, car A has a displacement that is ______ times as great as the displacement of car B. a. two b. four c. nine d. sixteen e. eight