NCERT Class VII Science Solutions: Chapter 13Motion and Time Part 5
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LONG ANSWER QUESTIONS
Question 18:
Given below as Figure is the distancetime graph of the motion an object

What will be the position of the object at ?

What will be the distance travelled by the object in ?

What is the average speed of the object?
Answer:

from the starting point


Question 19:
Distance between Bholu’s and Golu’s house is . Bholu has to attend Golus birthday party at . He started from his home at on his bicycle and covered a distance of 6 km in 40 minutes. At that point he met Chintu and he spoke to him for and reached Golu’s birthday party at with what speed did he cover the second part of the journey? Calculate his average speed for the entire journey.
Answer:
From the question, Bholu covers the remaining 3 km distance in 15 min.
So, speed of Bholu
Now, average speed
Question 20:
Boojho goes to the football ground to play football. The distance time graph of his journey from his home to the ground is given as Figure.

What does the graph between point B and C indicate about the motion of Boojho?

Is the motion between uniform or nonuniform?

What is his speed between of his journey?
Answer:

Boojho is at rest, i.e. his speed is zero

Nonuniform

As, speed