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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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