Braking force

[Guest daze]

Hi everyone im new here.I need to know how to work out the braking force required to a vehicle that weighs 10 tonne to a stop from 72km/h in 5m/s-2 i have to express the answer in kN. thanks.Also how do I work out braking effeiency?

[Guest daze]

Please someone help

[Klaynos]

ok well newtons laws tell us that:

 

F=ma

 

you state that you have an acceleration of 5m/s-2, and a mass of 10000 kilogram (assuming you ment a metric ton?)

 

This will provide you with the breaking force. As for breaking efficiency I'm afraid it was a long time ago I did that so cannot remember.