A particle is moving on the -axis and is initially at the origin. Its velocity, metres per second, at time seconds is given by

1. What is the initial velocity of the particle?  (1 mark)
   

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2. Find an expression for the acceleration of the particle.  (2 marks)
   

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3. Find the time when the acceleration of the particle is zero.  (1 mark)
   

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4. Find the position of the particle when .  (3 marks)
   

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