# Maths help! No joke!Watch

#1
Would anyone mind helping me with this question?
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#2
0
#3
Is it 315?
0
#4
Anyone?
0
1 week ago
#5
The constant of proportionality should be 5.
Post your working if you're unsure.
(Original post by Panicky student)
Is it 315?
0
#6
You’ve lost me
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1 week ago
#7
How did you get 315?

(Original post by Panicky student)
You’ve lost me
0
1 week ago
#8

I don’t think I’m right but I got this ...
Got the same answer via a different method:
Last edited by zackforest; 1 week ago
0
1 week ago
#9
There is no need to bring speed into it. Just say

d = k*t^2

And use the d=45, t=3 to solve for k. Then evaluate when t=7.
(Original post by zackforest)

I don’t think I’m right but I got this ...
0
1 week ago
#10
Lol I know, I was just testing alternative methods... I edited the original comment to show the easier way of answering it
(Original post by mqb2766)
There is no need to bring speed into it. Just say

d = k*t^2

And use the d=45, t=3 to solve for k. Then evaluate when t=7.
1
6 days ago
#11
(Original post by Panicky student)
Would anyone mind helping me with this question?
We are given that is directly proportional to , therefore we write where we have introduced the constant of proportionality .
We are given that when , , from which we deduce that .
Much confusion in this thread seems to have arisen from the wording of the question. It asks for the distance travelled in the next 7 seconds, which is most easily found by calculating the total distance travelled after 10 seconds and subtracting the distance that the ball fell during the first 3 seconds (i.e. 45 metres).
You should find that the ball in fact traverses 455 metres during the time interval between and .
Last edited by max271; 6 days ago
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