Abicycle racer sprints at the end of a race to clinch a victory. the racer has an initial velocity of 11.5 m/s and accelerates at the rate of 0.500 m/s2 for 7.00 s. (a) what is his final velocity? (b) the racer continues at this velocity to the finish line. if he was 300 m from the finish line when he started to accelerate, how much time did he save? (c) one other racer was 5.00 m ahead when the winner started to accelerate, but he was unable to accelerate, and traveled at 11.8 m/s until the finish line. how far ahead of him (in meters and in seconds) did the winner finish?
Solved
Show answers
More tips
- D Dating, Love, Relationships Is it a Compliment or Flattery: What s the Difference?...
- H Health and Medicine What Are the Best Vitamins? A Scientific View on Vitamin Supplements...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- C Computers and Internet How to Set Up Internet on iPhone? Detailed Guide with Step-by-Step Instructions...
- F Family and Home How to Teach Your Child to Speak: Tips and Recommendations...
- P Philosophy Agnosticism: Opinion or Belief?...
- S Style and Beauty How to choose the best mascara for your eyelashes...
- F Food and Cooking Discover Delicious Recipes You Can Make with Ground Meat...
- C Computers and Internet Google Search Tips and Tricks: Everything You Need to Know...
- S Science and Technology Why is there no gravity on other planets?...
Answers on questions: Physics
- P Physics Every just.. (Fill in the blank) Social experiment for Mystery of the Mind...
- P Physics Amanda wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically? A) burning the sugar cube with a match B)...
- P Physics What are the colors of talc and corundum...
- P Physics The density of mercury is 13.5 g/ml and the density of water is 1.00 g/ml. if a mercury barometer reads 727 mmhg, what is the barometric pressure in cmh₂o?...
- P Physics Describe the difference between uniform motion and uniform circular motion...
- P Physics The wave frequency is where 1 hertz equals 1 wave passed a fixed point in 1 second. assume that 10 waves pass a fixed point in 5 seconds. what is the frequency of the waves...
- P Physics Which of these demonstrates a major way the oceans create earth s climate?...
- H History What was the result of the restoration in England...
- M Mathematics The length and breadth of a rectangular field are in the ratio 5:4 if the perimeter is 90m find its area?...
- A Advanced Placement (AP) View the political cartoon titled Slavery as It Exists in America. Slavery as It Exists in England” here. What is the main purpose of the cartoon? to call attention to the benefits...
Ответ:
given,
initial velocity = 11.5 m/s
acceleration = 0.5 m/s²
time = 7 s
a) using equation of motion
v = u + a t
v = 11.5 + 0.5 × 7
v = 15 m/s
b)![s = u t + \dfrac{1}{2}at^2](/tpl/images/0277/2750/d9196.png)
s = 92.75 m
distance traveled by racer with final velocity
d = 300 - 92.75
= 207.25 m
time spend to travel 207.25
t = 13.82 s
total time spent to travel 300m
t = 7 + 13.82
t = 20.82 s
time required to travel 300 m with initial velocity
= 26.09 s
time saved due to acceleration
t = 26.09 - 20.82 = 5.27 s
c) second racer is 5 m apart from the first one
distance traveled by the second racer till first one finishes the race
distance behind the leader
d = 300 -5 -245.676 = 49.34 m
time behind the winner
Ответ: