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प्रश्न
Study the graph given below of a person who started from his home and returned at the end of the day. Answer the questions that follow.
- At what time did the person start from his home?
- How much distance did he travel in the first four hours of his journey?
- What was he doing from 3 pm to 5 pm?
- What was the total distance travelled by him throughout the day?
- Calculate the distance covered by him in the first 8 hours of his journey.
- At what time did he cover 16 km of his journey?
- Calculate the average speed of the man from (a) A to B (b) B to C.
- At what time did he return home?
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उत्तर
Observing the graph carefully, we conclude that
- At 10 AM, the person start from his home.
- In first 4 h (i.e. till 2 PM), he travelled 16 km.
- He was taking rest from 3 PM to 5 PM.
- The total distance covered by the person throughout the day was 40 km, i.e. 20 km from A to S and then 20 km from C to D.
- The distance covered by him in the first 8 h i.e. from 10 AM to 6 PM was 24 km.
- He covered 16 km of his journey at 2 PM.
- The total distance covered from A to S = 20 km and the time taken to travel from A to B = 5 h
∴ Average speed of the man from A to B = `20/5` = 4 km/h and average speed from S to C = `0/2` = 0 km/h - He returned home at 10 PM.
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संबंधित प्रश्न
Write the coordinates of each of the vertices of each polygon in Fig. 27.9.
In the point (4, 7), 4 denotes the ______.
Match the ordinates of the points given in Column A with the items mentioned in Column B.
| Column A | Column B |
| (a) (7, 0) | (i) The ordinate is double the abscissa. |
| (b) (11, 11) | (ii) The ordinate is zero. |
| (c) (4, 8) | (iii) The ordinate is equal to the abscissa. |
| (d) (6, 2) | (iv) The abscissa is double the ordinate. |
| (e) (0, 9) | (v) The abscissa is triple the ordinate. |
| (f) (6, 3) | (vi) The abscissa is zero. |
Write the x-coordinate (abscissa) of the given point.
(7, 3)
Write the y-coordinate (ordinate) of the given point.
(4, 0)
If y-coordinate is 3 times x-coordinate, form a table for it and draw a graph.
Locate the points A(1, 2), B(4, 2) and C(1, 4) on a graph sheet taking suitable axes. Write the coordinates of the fourth point D to complete the rectangle ABCD.
Draw a parallelogram ABCD on a graph paper with the coordinates given in Table I. Use this table to complete Tables II and III to get the coordinates of E, F, G, H and J, K, L, M.
| Point | (x, y) |
| A | (1, 1) |
| B | (4. 4) |
| C | (8, 4) |
| D | (5, 1) |
Table I
| Point | (0.5x, 0.5y) |
| E | (0.5, 0.5) |
| F | |
| G | |
| H |
Table II
| Point | (2x, 1.5y) |
| J | (2, 1.5) |
| K | |
| L | |
| M |
Table III
Draw parallelograms EFGH and JKLM on the same graph paper.
Plot the points (2, 4) and (4, 2) on a graph paper, then draw a line segment joining these two points.
