Maths question mech help please
Hi, please could I have some help on the last part of this question? I differentiated it and got 20-2t=4 but the markscheme says it’s equal to -4, not sure why ?
Question: https://ibb.co/YT3KX5t2
Thanks!
Question: https://ibb.co/YT3KX5t2
Thanks!
Original post by anonymous56754
Hi, please could I have some help on the last part of this question? I differentiated it and got 20-2t=4 but the markscheme says it’s equal to -4, not sure why ?
Question: https://ibb.co/YT3KX5t2
Thanks!
Question: https://ibb.co/YT3KX5t2
Thanks!
edit for t>10, your velocity dx/dt is negative so the only way it could correspond to a speed of 4 is if the velocity is -4.
(edited 1 month ago)
Original post by mqb2766
its hard to see the graph, but the speed is 4 and dx/dt is velocity so I presume youre given information that the velocity is negative at that point so -4.
I don’t think there’s any information on velocity =-4
Original post by anonymous56754
I don’t think there’s any information on velocity =-4 
I edited the previous post just before you replied. dx/dt is negative for t>10 so the only way the speed can be 4 is if the velocity is -4.
Original post by mqb2766
I edited the previous post just before you replied. dx/dt is negative for t>10 so the only way the speed can be 4 is if the velocity is -4.
Oh so because for all values greater than 10 for time, the velocity is negative so velocity must be -4?
Original post by anonymous56754
Oh so because for all values greater than 10 for time, the velocity is negative so velocity must be -4?
Yes.
Original post by mqb2766
Yes.
Thank you!
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