The graphs at the right show motion data for a race between a dragster and a jet
ID: 1866233 • Letter: T
Question
The graphs at the right show motion data for a race between a dragster and a jet car. The dotted vertical line marks the time when the winner crosses the finish line. Answer the next 5 questions. 4. . Who wins the race? Time a. The dragster b. The jet car. c. It's a tie. 5. Who has the fastest instantaneous speed at the moment the race Is won? a. The dragster. b. The jet car. a. The dragster. b. The jet car. c. It's a tie. a. The dragster. b. The jet car. c. Neither. d. Both. a. The dragster. c. It's a tie. 6. ? Who has the fastest average speed at the moment the race is won? -L- . Which car moves with constant acceleration? 8. Who covers more ground in the same amount of time? ? Time 81-jetcar b. The jet car. c. It's a tie. Time 9. ? Alan Shepard struck a golf ball while on the moon. Assuming an initial velocity of 70 m/s with a launch angle of 30° up from the horizontal surface, how high could the golf ball go? (Assume gnoon 1.6 m/s. FYI: sin 30 0.5) a. y=? a sin(70 m/s sin (30°)(490m/510.25) 382.8 m -1580 m , 2(1.6 m/s.) (32 m/s (3.2 m/s) 382.8m-380 m 2g ( sin(70 m/s sin" (30) (4900 m' )1025) 1914m- 10m (v, sin ) (70 m/s) sin (30°) (4900 m'/s)(0.25) 4g 4(1.6 m/s') (6.4 m/s') 2(v, sin ) 2(70 m/s) sin (30) (9800 m'/s)(0.25) 25)153125 m -150 m 153 1.25 m1500m] 1.6 m/s (v, sin ? y (70m/s)' sin' (30°) (4900 m'/s)(0.25) d. 765.6 m 770 m 1.6 m/s 1.6 m/s y=v,sind = (70 m/s)sin(30°)=(7O m/s)(0.5) = 35 m 21.875 m] =[22m e. 1.6 m/s) 1.6Explanation / Answer
4) It’s tie
All graphs shows that both vehicles come to the finish line at the same time. Hence it’s tie.
5) The jet car
From velocity-time graph it is clear that at the finish point jet car has more instantaneous velocity than dragster.
6) The jet car
Vave = (Vf-Vi)/2
From velocity-time graph , Vf for jet car is more than Vf for dragster. Both have same value of vi. Hence Vave will be more for jet car.
7) Neither
From acceleration-time graph it is clear that no vehicle has constant acceleration. Both accelerations are variable.
8) It’s tie
Distance-time graph shows that dragster travelled more distance than jet car.
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