EL E2. E3. ES. ET. ES. E9. EllL El4. EIl5. SPIL. A steel ball is dropped from a diving platform (with an initial velocity of zero). Using the approximate value of g = 10 m/s: a. What is the velocity of the ball 0.7 seconds after its release? _ {A] b. What is its velocity | 4 seconds after its release? _ {&] For the ball in exercise E1 (2] : a. Through what distance does the ball fall in the first 0.7 seconds of its flight? (Assume g = 10 m/s2) b. How far does it fall in the first 1.4 seconds of its flight? A large rock is dropped from the top of a high cliff. Assuming that air resistance can be ignored and that the acceleration has the constant value of 10 nv/sZ, how fast would the rock be traveling 6 seconds after it is dropped? What is this speed in MPH? (See conversion factors (7 .) _ (A A ball is thrown downward with an initial velocity of 14 m/s. Using the approximate value of g = 10 m/s2, what is the velocity of the ball 3.0 seconds after it is released? _ {A] A ball is thrown upward with an initial velocity of 13 m/s. Using the approximate value of g = 10 m/s2, what are the magnitude and direction of the ball's velocity: a. | second after it is thrown? _ {a] b. 2 seconds after it is thrown? _ {&] How high above the ground is the ball in exercise 7 ({2 : a. | second after it is thrown? b. 2 seconds after it is thrown? At what time does the ball in exercise 7 (2] reach the high point in its flight? (Use the approximate value of g = 10 m/s2, and remember that the velocity is equal to zero at the highest point.) _ {A] o A bullet is fired horizontally with an initial velocity of 800 m/s at a target located 200 m from the rifle. a. How much time is required for the bullet to reach the target? _ {A] b. Using the approximate value of g = 10 m/s%, how far does the bullet fall in this time? _ {&] A ball rolls off a table with a horizontal velocity of 3 m/s. If it takes 0.4 seconds for it to reach the floor: a. What is the vertical component of the ball's velocity just before it hits the floor? (Use g = 10 m/s%) b. What is the horizontal component of the ball's velocity just before it hits the floor? A ball rolls off a platform that is 3 meters above the ground. The ball's horizontal velocity as it leaves the platform is 5 m/s. a. How much time does it take for the ball to hit the ground? (See example box 3.3(Z . use g = 10 m/s2) _ {&] b. How far from the base of the platform does the ball hit the ground? _ {A] A ball is thrown straight upward with an initial velocity of 18 m/s. Use g = 10 m/s? for computations listed here. a. What is its velocity at the high point in its motion? _ {a] b. How much time is required to reach the high point? _ {a] c. How high above its starting point is the ball at its high point? _ {&] d. How high above its starting point is the ball 3 seconds after it is released? _ {& e. Is the ball moving up or down 2 seconds after it is released? _ {A] SP3. Two balls are rolled off a tabletop that is 0.7 m above the floor. Ball A has a horizontal velocity of 4 m/s, and that of ball B is 6 m/s. a. Assuming g = 10 m/sZ, how long does it take each ball to reach the floor after it rolls off the edge? _ {& b. How far does each ball travel horizontally before hitting the floor? _ (A c. If the two balls started rolling at the same time at a point 1.5 m behind the edge of the table, will they ' Page 58 reach the floor at the same time? Explain. _ {A] Q1 Which of the curves in the figure best shows the speed of an object falling from rest without air friction? 3| A o o w B C Time Q2 A football is thrown upward at some angle above the horizomal. If we neglect air friction, then we can conclude that the acceleration vector of the football is (O opposite 1o the velocity vector. O Zero. (O along the direction of motion. O down. Qa3 A body released from rest falls with an acceleration of 9.8 m/s2. If the same body ks thrown upward at an angle, and air resistance |s negligible_ its acceleration after release will be 0 downward and less than 9.8 m/s? downward and equal 10 9.8 m/s2. downward and grester than 9.8 m/s? upward and equal 10 9.8 m/s. O 00O upward and greater than 9,8 m/s? Q4| You toss a ball straight up in the air. At the highest point, the ball's A, velocity and acceleration are zero. B. acceleration is zero but not its velocity. C. velocity is zero and the acceleration is upward. D, velocity is zero and the acceleration is downward. Q3|. A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball which hits the ground at the base of the cliff with the greater speed is the one initially thrown A. upward. B. downward, C..both hit with the same speed