Page • A car accelerates at a rate of3.0 m/sec2 . !fits original speed is 8.0 m/sec, how many seconds will it take the car to reach a final speed of25.0 m/sec? Looking for Solution The time to reach the final speed. Time = 25.0m/sec - 8.02m/sec Given 3.0 m/sec Beginning speed= 8.0 m/sec Final speed= 25.0 m/sec Time = 17 .0m/sec2 = 5•7 sec 3.0m/sec Acceleration = 3.0 m/sec2 The time for the car to reach its is 5. 7 seconds. Relationship - Vz -VI /--- 1. While traveling along a highway a driver slows from 24 m/sec to 15 m/sec in 12 seconds. What is the automobile's acceleration? (Remember that a negative value indicates a slowing down or deceleration.) Looking for Given Relationship aC Solution 2. A parachute on a racing dragster opens and changes the speed of the car from 85 m/sec to 45 m/sec in a period of 4.5 seconds. What is the acceleration ofthedragster? 4.s-R>/15" �: F/8/m Iser ; (Yi /sr-c ,_ 3. The cheetah, which is the fastest land mammal, can accelerate from 0.0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec. 7D _ Cf3 -: JS• 33 I !Y1Ph ;:sec 4. The Lamborghini Diablo sports car can accelerate from 0.0 km/hr to 99.2 km/hr in 4.0 seconds. What is the acceleration of this car? Give your answer in units ofkilometers per hour/sec. C/q, 2. _ Of4 -: 24 5. Which has greater acceleration, the cheetah or the Lamborghini Diablo? (To figure this out, you must remember that there are 1.6 kilometers in 1 mile.) Be sure to show your calculations. ,K f!.mh/ rn 'I /.� .k ' • • -��;�l,{- • 6. The table belo�ludes d!!_ta for a ball rolling down a hill. Fill in the missing data values in the table :� ancl@etenmne-the accelerati� of the rolling ball. _ _ Ac..ce le (Dltion ($ 1•5 /::mf n/Sr-c 9 15 7. A car traveling at a speed of 30.0 m/sec encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if its rate of deceleration is -4.0 m/sec2? 0 -3 /-4.0 : ·7, Set: , 5 8. If a car can go fro�Jfto6G.Omi/hr in 8.0 second§;what would be its final speed after 5.0 secondsif its starting speed were 5-0.0 mi/hr? +( 7, S x� -::. rr, prJ 3·1. 5 50 9. A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/sec2. If the cart has a beginning speed of2.0 m/sec, what is its final speed? 4J) 'I, S) -:. ;);;Jmjsec d,/) -r (__ 10. A helicopter's speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter? (c/)-;;) 5/ 7 Sec../11. Below are three situations. In which is the acceleration most similar to the helicopters in question 1 0? S- -_ a. An object going from 0 m/sec to 25 m/sec in 5 seconds. b. An object going from 0 m/sec to 7 m/sec in 2 seconds. c. An object going from 5 km/h to 30 km/h in 1 second. rn/ 5? (Y)C / 5e<" i. ,.:..:J rn /.Si"c l / r:-. 1 I a � ,,· I Yn :;llrn•,,, ; (b 1 !.. 1 - I - sJ\. ....t --_ (b 5. C Match each of the three car and ramp experiments with the appropriate speed vs. time graph. --- sE , _ -rs 4. J I • 1il-Tlme , 0 • Time , I I I Time A car rolling down a ramp starts with a speed of 40 emfs. The car keeps rolling and 2 seconds later the speed is 80 emfs. Calculate the acceleration of the car in cm!rl-. The following two graphs were made from an experiment with a car rolling down a ramp. Calculate the acceleration of the car in m/s2 . Uf,t_ --t\tt,t lo e. -, Cl :::- rise-/ nJ. n s q -----, -2.5......---& GI �2.0 e GI -1.5 GI Speed vs. Distance i1.0 .... �0.5 w 0L-�--�--� 0 0.2 0.4 0.6 0.8 Distance (m) Speed vs. Time 1.0 .. 'ui"2.4 ......-------, e 2.0 :; 1.6 2l_ 1.2 " " C/l o.8!,l-,._.....,....---.,,.....-_,.J, 0.2 0.4 Time(s) 0.6 0.8

Phys Speed and Acceleration

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