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:

Formula of Time Speed and Distance

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.

As Showing in Images is a Rectangular

Answer:

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

As Showing in Images is a Distance-Time Graph of the Motion …

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-Distance Graph
Time (s)x15304560
Distance (cm)y16324864
As Showing in Images is a Distance-Time Graph of the State