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If a ball is given a push so that is has an initial velocity of 5 m/s down a certain inclined plane, then the distance

If a ball is given a push so that is has an initial velocity of 5 m/s down a certain inclined plane, then the distance it has rolled after t seconds is s=5t+3t2

a.) find velocity after 2s

b.) how long does it take for the velocity to reach 40 m/s

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