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# Form 4 Mathematics Sample Revision Questions and Answers Set 3

The velocity of a particle after t seconds is given by V = 20t – 2t^2. If the particle starts from rest at point O and moves along a straight line; it comes momentarily to rest at point P and starts
moving again back towards O. Determine:
(a) The time when the particle reaches O while on its way back from P.
(b) The expression for its acceleration a.

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