# NCERT Class VII Science Solutions: Chapter 13-Motion and Time Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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**:

Time (s) | x | 15 | 30 | 45 | 60 |

Distance (cm) | y | 16 | 32 | 48 | 64 |