# Maths AS level Mech question

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#1
Just wondering how the answer to part ii is true as it's accelerating from 10m/s to 20m/s in 28s but the answer is less than 280m. Please explain, using a graph if you can.
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#2
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1 month ago
#3
(Original post by ogaillard)
Just wondering how the answer to part ii is true as it's accelerating from 10m/s to 20m/s in 28s but the answer is less than 280m. Please explain, using a graph if you can.

Why do you think the answer cannot be less than 280m? Do you feel that the acceleration must be greater than 10m/s??
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#4
S=ut
u>=10 (as a >=0)
t =28
so S >=280
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#5
The car is accelerating from 10m/s to 20m/s, so the minimum speed is 10m/s
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