A level maths mechanics question
I think the mark scheme for this question is wrong but I'm not sure.
2. A competitor makes a dive from a high springboard into a diving pool. She leaves the springboard vertically with a
speed of 4 ms-1 upwards. When she leaves the springboard, she is 5 m above the surface of the pool. The diver is modelled
as a particle moving vertically under gravity alone and it is assumed that she does not the springboard as she descends.
Find
a. Her speed when she reaches the surface of the pool, (3)
b. The time taken to reach the surface of the pool. (3)
For question b, surely you have to find the time taken to reach the highest point and then the time taken to come back down again right? I did that and got an answer of 2.4 seconds. In the mark scheme, however, they just use v = u + at using the u as 4 and got t = 1.5s.
This seems wrong to me as they didn't take into consideration the time it took for the diver to go up and then down right?
2. A competitor makes a dive from a high springboard into a diving pool. She leaves the springboard vertically with a
speed of 4 ms-1 upwards. When she leaves the springboard, she is 5 m above the surface of the pool. The diver is modelled
as a particle moving vertically under gravity alone and it is assumed that she does not the springboard as she descends.
Find
a. Her speed when she reaches the surface of the pool, (3)
b. The time taken to reach the surface of the pool. (3)
For question b, surely you have to find the time taken to reach the highest point and then the time taken to come back down again right? I did that and got an answer of 2.4 seconds. In the mark scheme, however, they just use v = u + at using the u as 4 and got t = 1.5s.
This seems wrong to me as they didn't take into consideration the time it took for the diver to go up and then down right?
Original post by Snigdha02
I think the mark scheme for this question is wrong but I'm not sure.
2. A competitor makes a dive from a high springboard into a diving pool. She leaves the springboard vertically with a
speed of 4 ms-1 upwards. When she leaves the springboard, she is 5 m above the surface of the pool. The diver is modelled
as a particle moving vertically under gravity alone and it is assumed that she does not the springboard as she descends.
Find
a. Her speed when she reaches the surface of the pool, (3)
b. The time taken to reach the surface of the pool. (3)
For question b, surely you have to find the time taken to reach the highest point and then the time taken to come back down again right? I did that and got an answer of 2.4 seconds. In the mark scheme, however, they just use v = u + at using the u as 4 and got t = 1.5s.
This seems wrong to me as they didn't take into consideration the time it took for the diver to go up and then down right?
2. A competitor makes a dive from a high springboard into a diving pool. She leaves the springboard vertically with a
speed of 4 ms-1 upwards. When she leaves the springboard, she is 5 m above the surface of the pool. The diver is modelled
as a particle moving vertically under gravity alone and it is assumed that she does not the springboard as she descends.
Find
a. Her speed when she reaches the surface of the pool, (3)
b. The time taken to reach the surface of the pool. (3)
For question b, surely you have to find the time taken to reach the highest point and then the time taken to come back down again right? I did that and got an answer of 2.4 seconds. In the mark scheme, however, they just use v = u + at using the u as 4 and got t = 1.5s.
This seems wrong to me as they didn't take into consideration the time it took for the diver to go up and then down right?
I agree with the markscheme answer too. If you're unsure, try calculating total time as (time to highest point) + (time from highest point to pool) and see if you can see what's going on. I suspect there is a subtle use of positive and negative speeds in the v = u + at equation that you're not recognising
Quick Reply
Related discussions
- Where can I find AS mechanics Edexcel questions ?
- A-level Maths Study Group
- A-level Mathematics Study Group 2023-2024
- Engineering Foundation year (help!!)
- University of Birmingham - The School of Engineering Mathematics Aptitude Test
- a level maths content
- Trinity Hall maths interview advice
- a levels needed for mechanical engineering?
- Mechanical Engineering
- Mechatronics engineering
- Mechanical or aerospace engineering
- recapping key skills for maths, but the PPQs make that completely irrelevant?
- Worried about studying Chemistry at UNI
- Starting A-level content early
- A- level opinions
- Further Maths or Physics A Level
- HNC mechanical engineering
- How Hard is A Level Further Maths?
- A-Level Further Maths Options
- A level options
Latest
Trending
Last reply 4 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
Trending
Last reply 4 days ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
