Sums on average velocity for class 9 at least 3 sums Plz.. Its urgent
Answers
Answer:
Ok your questions are down there.
1. If a body moves from a to b covering a distance of 90 metres in 45 sec. Find the average velocity of the body.
2. If a body revolves around a circle of radius 7 metre in 22 second. Find the average velocity of the body.
3. A body travels from a to b covering a distance of 200 metres in 20 seconds. And return from b to half away of A covering a distance of 100 m in 9 sec. Find the average velocity of the body.
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Answer:
(i)Calculate the average velocity at a particular time interval of a person if he moves 7 m in 4 sec and 18 m in 6 sec along x-axis?
(ii) A car travels along a straight road to the east for 100 meters in 4 seconds, then go the west for 50 meters in 1 second. Determine average speed and average velocity.
(iii)A person walks 4 meters east in 1 second, then walks 3 meters north in 1 second. Determine average speed and average velocity.
Explanation:
(i)Initial distance traveled by the person, xi = 7 m,
Final distance traveled, xf = 18 m,
Initial time interval ti = 4 sec,
Final time interval tf = 6 sec,
Average velocity Vav = xi−xf/tf−ti=18−7/6−4=11/2 = 5.5 m/sec.
(ii)Distance = 100 meters + 50 meters = 150 meters
Displacement = 100 meters – 50 meters = 50 meters, to east.
Time elapsed = 4 seconds + 1 second = 5 seconds.
Average speed = Distance / time elapsed = 150 meters / 5 seconds = 30 meters/second.
Average velocity = Displacement / time elapsed = 50 meters / 5 seconds = 10 meters/second.
(iii)Distance = 4 meters + 3 meters = 7 meters
Displacement = = meters, to northeast.
Time elapsed = 1 second + 1 second = 2 seconds.
Average speed = distance / time elapsed = 7 meters / 2 seconds = 3.5 meters/second
Average velocity = displacement / time elapsed = 5 meters / 2 seconds = 2.5 meters/second
Note: Picture for question 3
