
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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3. Car A traveling with an initial velocity of 15 m/s has an acceleration of ½ m/s². Car B
which is initially 50 m ahead of car A has a constant velocity of - 30 m/s.
Youth
a) At what times will car A and car B have the same positions?
AHR
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Write the second kinematic equation for car B and substitute the corresponding values.
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- John drops a stone, from rest, at the top of a 40 meter high cliff. His friend Bob throws astone upward from the base of the cliff giving it an initial velocity of 30 m/s. The stones arethrown/dropped at exactly the same instant. Assume Bob’s stone is initially on the ground ata position of 0 meters, while John’s stone starts 40 meters from the ground and that bothstones experience only free fall motion.a) At what time, after he has thrown it, does Bob’s stone to hit the ground?b) At what time, do the two stones pass each other?arrow_forwarda = 3 m/s2 d= 400 m = finish line half-way = 200 marrow_forwardAS. Find the instantaneous velocity of the particle described in the right figure at the following times (m) 10 For t-05s, r-( 1 m's For t-255, e-(4 I ms For t44s, ( m/s For t-735, -( m/sarrow_forward
- BONUS As John (1.7-m tall) is walking along the sidewalk at 5.0-km/hr. When he is 6.0-m from the edge of the balcony 16.0-m above, Mrs. Malodroit knocks her flower pot off of the edge. Will the flower pot fall before John, on John, or after John? If it misses John, by how many meters (before or after). If it hits John, how fast was it traveling when it hit him?arrow_forwardA rock is released from rest from the top of a very high cliff, and accelerates dovnward at acceleration due to gravity, g. How far does the rock travel (in m) in the first seconds of its ree-fall?arrow_forwardKACTICE ANOTHER Near the end of a marathon race, the first two runners are separated by a distance of 45.0 m. The front runner has a velocity of 3.50 m/s, and the second a velocity of 4.20 m/s. (a) What is the velocity of the second runner relative to the first? m/s faster than the front runner. (b) If the front runner is 250 m from the finish line, who will win the race, assuming they run at constant velocity? O The first runner will win. O The second runner will win. (c) What distance ahead will the winner be when she crosses the finish line? m Additional Materials Reading ASK YOUR TEACHER PRACTICE ANOTHE MY NOTESarrow_forward
- A girl tosses a ball straight up from the rooftop of a 12-m building. The ball falls past her 0.75 s later. Determine the velocity at which the ball was thrown. Calculate the time of flight. Compute the velocity of the ball when it strikes the ground.arrow_forwardwhat is the answer for the first qustion?arrow_forwardA billiard ball was set in motion on a counter by your mischievous little cousin who wanted the ball to hit your foot. To avoid your attention he set the ball in motion with a slow speed of 1.0 m/s (how did he know this unit?!) from a counter that is 1.1 m tall. Fortunately he missed. How long did it take to hit the floor?arrow_forward
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