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4. A car has a velocity of 20 m/s after 1 min. The car increases its velocity 2X uniformly for 30 s. After this time

4. A car has a velocity of 20 m/s after 1 min. The car increases its velocity 2X uniformly for 30 s. After this time if has a velocity if 50 m/s. What is the car's acceleration in this time period ? 6

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