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प्रश्न
The distance between Bholu’s and Golu’s house is 9 km. Bholu has to attend Golu’s birthday party at 7 o’clock. He started from his home at 6 o’clock on his bicycle and covered a distance of 6 km in 40 minutes. At that point, he met Chintu and spoke to him for 5 minutes and reached Golu’s birthday party at 7 o’clock. With what speed did he cover the second part of the journey? Calculate his average speed for the entire journey.
उत्तर
Distance between Bholu’s and Golu’s house = 9 km
Distance covered by Bholu in the first part of the journey
= 6 km
Time is taken to cover 6 km = 40 min
Distance covered by Bholu in the second part of the journey
= 9 − 6
= 3 km
Time is taken to cover 3 km
= 60 – (40 + 5)
=15 min
Speed of Bholu while covering the second part of the journey = `(3"km")/((15/60)"h")`
= 12 km/h
The average speed of Bholu for the entire journey
= `("Total distance")/("Time taken")`
= `(9"km")/(60 "min")`
= 9 km/h
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संबंधित प्रश्न
What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
Show the shape of the distance-time graph for the motion in the following case:
A car moving with a constant speed.
Show the shape of the distance-time graph for the motion in the following case:
A car parked on a side road.
What does the slope of a distance-time graph indicate ?
What can you say about the motion of a body whose distance-time graph is a straight line parallel to the time axis ?
What are the uses of the graphical study of motion?
Boojho goes to the football ground to play football. The distance-time graph of his journey from his home to the ground is given in Figure 13.9.
(a) What does the graph between points B and C indicate about the motion of Boojho?
(b) Is the motion between 0 to 4 minutes uniform or nonuniform?
(c) What is his speed between 8 and 12 minutes of his journey?
The slope of the distance-time graph indicates the speed.
Assertion: The position-time graph of a uniform motion in one dimension of a body can have a negative slope
Reason: When the speed of the body decreases with time then, the position-time graph of the moving body has a negative slope.
What do you infer if
- Distance – time graph is a straight line.
- The velocity-time graph is curved.
- Displacement time is zigzag.
