# physics30sh

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a 1000 kg car engine exerts a force of 3000 N while the car accelerates from 20 m/s to 30 m/s is 5.0 seconds. How much force of resistance does the car experience?

• physics30sh -

in those five seconds, the avg speed was 25m/s, so the distance covered was 125m

3000*125-forceresitance*125=change in KEnergy.

• physics30sh -

i don't get that at all...

• physics30sh -

the change of kinetic energy has to equal the work -frictonenergy that went into it.

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