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Find the averasge force needed to accele...

Find the averasge force needed to accelerate a car weighing 500 kg form rest to 72 km/h in a distance of 25 m.

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The correct Answer is:
D
mk500kg, u=0, v=70 km/h=20 m/sec
`a((v^2-u^2))/(2S)`
`=400/50=8m/sec^2`

Froce needed to accelerate the car
`F=ma=500xx8=400N`
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