# NCERT Class VII Science Solutions: Chapter 13-Motion and Time Part 4

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**Question 15:**

A spaceship travels 36,000 km in one hour. Express its speed in km/s.

**Answer:**

**Question 16:**

Starting from A, Paheli moves along a rectangular path ABCD as shown in Figure. She takes 2 minutes to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.

**Answer:**

Since the distance covered per unit time for the entire distance covered is not the same, the motion is non-uniform.

**Question 17:**

Plot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on respectively. The circumference of the circle traced by the second hand is.

**Answer:**

| x | 15 | 30 | 45 | 60 |

| y | 16 | 32 | 48 | 64 |