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metalx1000
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My wife is taking a Physics class and is having some trouble. I've never taken physics but I've tried to help, with no luck.
What net external force is required to accelerate a 1500kg car from rest to 100km/h in 10 seconds?
She believes that the right equation is:
F=ma
100km/1hour x 1hour/60sec = 100/60 = 1.7km/s
a=(1.7 km/s)/10s
a=0.17s/km
F=1500kg x 0.17s
F=255
-------------------------------
So we got '255N'The book says the answer is '4167N'
But it does not say how to get this.
She is studying for a test tomorrow.
Any help would be great.
Thanks
Homework Statement
What net external force is required to accelerate a 1500kg car from rest to 100km/h in 10 seconds?
Homework Equations
She believes that the right equation is:
F=ma
The Attempt at a Solution
100km/1hour x 1hour/60sec = 100/60 = 1.7km/s
a=(1.7 km/s)/10s
a=0.17s/km
F=1500kg x 0.17s
F=255
-------------------------------
So we got '255N'The book says the answer is '4167N'
But it does not say how to get this.
She is studying for a test tomorrow.
Any help would be great.
Thanks
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