2 The graph shows how the velocity of a particle varies during a 50 -second period as it moves forwards and then backwards on a straight line.
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- State the times at which the velocity of the particle is zero.
- Show that the particle travels a distance of 75 metres during the first 30 seconds of its motion.
- Find the total distance travelled by the particle during the 50 seconds.
- Find the distance of the particle from its initial position at the end of the 50 -second period.