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# Mechanics M1 help watch

1. The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
2. this recent discussion should help:

https://www.thestudentroom.co.uk/sho...4#post74158124
3. (Original post by Wiktoria_Ok)
The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
This is a suvat question - can you write out the variables you’re given and the ones you need to find?
4. (Original post by Protostar)
This is a suvat question - can you write out the variables you’re given and the ones you need to find?
How long until you change into a main sequence star?
5. (Original post by Wiktoria_Ok)
The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
Try using . Remember to use the same convention for which direction is positive for all the variables.
6. u=20 m/s
v=0
a=?
s=30m
t=?

To work out a, sub the values into the following equation and then re-arrange:
v^2=u^2+2as

To work out t, sub the values into the following equation and re-arrange:
s=1/2t(u+v)

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