Advertisements
Advertisements
प्रश्न
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?
उत्तर
(a) Graph between points B and C is a horizontal line that indicates that Boojho is at rest, i.e. his speed is zero.
(b) Motion between 0 to 4 minutes is non-uniform as distance-time graph for this time interval is not a straight line.
(c) Speed of Boojho between 8 and 1 minutes of his journey
= `((225 - 150)"m')/((12 - 8)"min")`
= `75/4`
= 18.75 m/min
APPEARS IN
संबंधित प्रश्न
What conclusion can you draw about the speed of a body from the following distance-time graph ?
What can you say about the motion of a body whose distance-time graph is a straight line parallel to the time axis ?
A cyclist is travelling at 15 m s-1. She applies brakes so that she does not collide with a wall 18 m away. What deceleration must she have ?
Two friends leave Delhi for Chandigarh in their cars. A starts at 5 am and moves with a constant speed of 30 km/h, whereas B starts at 6 am and moves with a constant speed of 40 kmh-1. Plot the distance-time graph for their motion and find at what time the two friends will meet and at what distance from Delhi.
What are the uses of the graphical study of motion?
Starting from A, Paheli moves along a rectangular path ABCD as shown in Figure 13.7. She takes 2 minutes to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.
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.
The area under velocity time graph represents ______.
The slope of the distance-time curve is steeper/greater is the ______.
What do you infer if
- Distance – time graph is a straight line.
- The velocity-time graph is curved.
- Displacement time is zigzag.
