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The distance x meters travelled by a vehicle in time t seconds after the brakes are applied is given by x=20t-5/3t. Determine (a) the

The distance x meters travelled by a vehicle in time t seconds after the brakes are applied is given by x=20t-5/3t. Determine (a) the speed of the vehicle (in km/h) at the instant the brakes are applied, and (b) the distance the car travels before it stops.

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