On turning a corner a car driver driving at $36 k m h^{- 1}$ , finds a child on the road $55 m$ ahead. He immediately applies brakes, so as to stop within $5 m$ of the child. If the retardation produced is x m $s^{- 2}$ and the time taken by the car to stop is y seconds. Find xy.

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Solution

$1 m s^{- 2}, 10 s$ .

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On turning a corner a car driver driving at 36 kmh−1, finds a child on the road 55 m ahead. He immediately applies brakes, so as to stop within 5 m of the child. If the retardation produced is x ms−2and the time taken by the car to stop is y seconds. Find xy.

1 ms−2,10 s.

On turning a corner a car driver driving at $36 k m h^{- 1}$ , finds a child on the road $55 m$ ahead. He immediately applies brakes, so as to stop within $5 m$ of the child. If the retardation produced is x m $s^{- 2}$ and the time taken by the car to stop is y seconds. Find xy.

$1 m s^{- 2}, 10 s$ .