CBSE Class 9: Speed and Velocity Videos | Average Speed

• bus shows the uniform velocity bus travels 20 km in 40 min but travels 40 km in 80 min draw distance time graph for it
• a train of length 200mts passess over a bridge of length 600mts. how long does it take to cross the bridge with a uniform speed of 36 km/hour
• an athlete complete one round of a circular track of diameter 200 m is 40 second what will be the distance covered and the displacement at the end of 2 minute and 20 second
• The average speed of a moving body can never be zero but the average velocity of a moving body can be zero. Justify.
•   Arrange the following speeds in increasing order(keeping the least speed first): (i) An athlete running with a speed of 10m/s. (ii) An bicycle moving with a speed of 200m/min. (iii) An scooter moving with a speed of 30km/h
• if u is an initial velocity v is final velocity of body and t is time taken by boddy to attain a velocity from u to v then find the value of acceleration A
• An object starts from rest and travels 20m in first 2 s and 160 m in 4 s . Find its velocity 7 s after the start .
• Two points A and B are located on the floor of a room 30cm and 20cm away from a wall. The distance between the points parallel to the wall is 50cm. An insect is at moving on the floor at 5cm/s. It has to first reach a point C on the wall and then reach B such that AC and BC make equal angles with Normal to the wall at C. The time taken for this  motion will be
• A student starts with a velocity 40 km/hr for school at 4 km away from his house. Due to closing of school he returns soon to his house with a velocity of 60km/hr.His average velocity will be.
• a body goes from a to b with a velocity of 20ms and come back from b to a the average velocity of 30ms the average velocity of the body during the whole journey is

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