Ned and Laurie had a race - Junior Cycle Mathematics - Question 9 - 2016
Question 9
Ned and Laurie had a race. Laurie was given a head start, so she ran a shorter distance than Ned. The graphs below show the distance along the track, in metres, that... show full transcript
Worked Solution & Example Answer:Ned and Laurie had a race - Junior Cycle Mathematics - Question 9 - 2016
Step 1
What distance did Ned run during the race?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Ned ran a total distance of 30 m.
Step 2
What distance did Laurie run during the race?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Laurie ran a total distance of 25 m.
Step 3
How many seconds did it take Laurie to finish the race?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
It took Laurie 10 seconds to finish the race.
Step 4
Work out Laurie's mean speed during the race, in metres per second.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Laurie's mean speed is calculated by the formula:
ext{Speed} = rac{ ext{Distance}}{ ext{Time}}
Substituting the values:
ext{Speed} = rac{25 ext{ m}}{10 ext{ s}} = 2.5 ext{ m/s}
Step 5
Is Ned correct? Give a reason for your answer.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Answer: No
Reason: The graph does not go in a straight line or any other valid reason.
Join the Junior Cycle students using SimpleStudy...
