# Figure 3.25 gives

We know that,

Slope of s-t graph represents acceleration.

y- Coordinate of point on s-t graph represents speed.

From the given s-t graph,

Slope is maximum in interval 2. So, it has maximum average acceleration.

y- Coordinate value of point in interval 3 has highest value thus, interval 3 has maximum average speed.

In interval 1,

Slope is positive. So, acceleration is positive.

y- Coordinate of points are positive. So, speed is positive.

In interval 2,

Slope is negative. So, acceleration is negative.

y- Coordinate of points are positive. So, speed is positive.

In interval 3,

Slope is positive. So, acceleration is positive.

y – Coordinate of points are positive. So, speed is positive.

At A, B and C slopes of curve are ‘0’. Thus, Acceleration at this point are zero.

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