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Name, Date, Hr/Per________________________________________________________________________________________________________________________ Speed & Acceleration Units – Distance (D), Time, (T), Speed (S), or Acceleration (A)? 1. _____ 14 km 4. _____ 4 hours 7. _____ 14 mi 10. _____ 1.4 m 2. _____ 30 m/s 5. _____ 12 cm/s2 8. _____ 3.2 sec 11. _____ 6 cm/min/sec 3. _____ 34 min 6. _____ 150 mph 9. _____ 25 ft 12. _____ 3 km/hr/sec Equations: Speed v= Distance d= Acceleration a= Time t= Time Final Velocity vf = t= SHOW ALL WORK WHEN COMPLETING THESE PROBLEMS. NO WORK, NO CREDIT. 1. It takes Serina 0.25 hour to drive to school. Her route is 16 km long. What is Serina’s average speed? GIVEN: WORK: FORMULA: ANSWER: 2. In a competition, an athlete threw a flying disk 139 meters through the air. While in flight, the disk traveled at an average speed of 13.0 m/s. How long did the disk remain in the air? GIVEN: WORK: FORMULA: ANSWER: 3. Josh rolled a bowling ball down a lane in 2.5 s. The ball traveled at a constant acceleration of 1.8 m/s2 down the lane and was traveling at a speed of 7.6 m/s by the time it reached the pins at the end of the lane. How fast was the ball going when it left Tim’s hand? GIVEN: WORK: FORMULA: ANSWER: 4. A lizard accelerates from 2 m/s to 10 m/s in four seconds. What is the lizard’s average acceleration? 5. Goldie, a goldfish, is a speed swimmer. The park’s pond is ½ of a kilometer long. If she can swim 20 laps around the pond in two hours, what is her average speed? 6. Falling objects drop with an average acceleration of 9.8 m/s2. If an object falls from a tall building, how long will it take before it reaches a speed of 49 m/s? . . . . 7. If you shout into the Grand Canyon, your voice travels at the speed of sound (340 m/s) to the bottom of the canyon and back, and you hear an echo. How deep is the Grand Canyon at a spot where you can hear your echo 5.2 seconds after you shout? 8. It takes Stu, a slimy slug, 20 minutes to travel from his favorite bush to the local trash can (a trip of 30 meters). How far can he travel in one hour? 9. A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s, but three seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration? 10. A cyclist accelerates from 0 m/s to 8 m/s in three seconds. A car accelerates from 0 to 30 m/s in eight seconds. Which has the higher rate of acceleration, and what is the rate? 11. Pete the penguin loves to sled down his favorite hill. If he hits a speed of 50 m/s after five seconds, what is his rate of acceleration? [hint – he starts at 0 m/s at the top of the hill] 12. If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s2 for three seconds, what will its final velocity be? 13. Monster Mike’s truck decelerates from 72 m/s to 0 m/s in six seconds. What is his rate of deceleration? 14. At exactly 2:00 pm, Speedy the snail craws onto a meter stick at the 10 cm mark. If he reaches the 65 cm mark at exactly 2:10pm, what is his speed? 15. Leaping Louie takes five minutes to jump three blocks. How long will it take him to jump 15 blocks?