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  # Mechanics- Suvat help needed watch
  
  1. A particle P is moving on the x-axis with constant deceleration 4ms-2. At time t=0, P passes through the origin O with velocity 14ms-1 in the positive direction. The point A lies on the axis and OA=22.5m.
  Find:
  
  a) Difference between the times when P passes through A
  - I have correctly worked this out as 2 seconds between t=4.5 and t=2.5
  
  b) Total difference travelled by P during the interval between these times
  - Answer is 4 metres but I don't know how to work it out.
  
  Any help would be greatly appreciated. Thank you!!
  2. (Original post by ango)
  A particle P is moving on the x-axis with constant deceleration 4ms-2. At time t=0, P passes through the origin O with velocity 14ms-1 in the positive direction. The point A lies on the axis and OA=22.5m.
  Find:
  
  a) Difference between the times when P passes through A
  - I have correctly worked this out as 2 seconds between t=4.5 and t=2.5
  
  b) Total difference travelled by P during the interval between these times
  - Answer is 4 metres but I don't know how to work it out.
  
  Any help would be greatly appreciated. Thank you!!
  It may help to break it up in two parts: one where the velocity is positive (I.e. The particle is moving from O to A and beyond), and when it is moving in the opposite direction.
  3. Work out the velocity at A then find the distance until its velocity is 0, double that.
  
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