# NCERT Class 9 Science Solutions: Chapter 8 – Motion Part 8

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Question 8:

Q. The speed-time graph for a car is shown is fig.8.12

(a)Find out how far the car travels in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

**Answer:**

The shaded area which is equal to represented the distance travelled by the car in the first 4 s.

(b) Which part of the graph represents uniform motion of the car?

**Answer:**

The part of the graph in red color between time 6 s to 10 s represents uniform motion of the car.

Question 9

State which of the following situations are possible and give an example for each of these:

Q. (a) an object with a constant acceleration but with zero velocity.

**Answer:**

Possible

When a ball is thrown up at maximum height, it has zero velocity, although it will have constant acceleration due to gravity, which is equal to 9.8

Q. (b) an object moving in a certain direction with an acceleration in the perpendicular direction.

**Answer:**

Possible

When a car is moving in a circular track, its acceleration is perpendicular to its direction.