Advertisements
Advertisements
Question
Figure shows the displacement of a body at different times .
Calculate the velocity of the body as it moves for time interval :
(i) 0 to 5 s,
(ii) 5 s to 7 s
(iii) 7 s to 9 s.
Advertisements
Solution
(a) (i) Velocity from 0 to 5 s = Displacement /time
= (3/5) m/s
= 0.6 m/s-1
(ii) Velocity from 5 s to 7 s = Displacement /time
= (0/2) m/s
= 0 m/s-1.
(iii) Velocity from 7 s to 9 s = Displacement /time
= (7 - 3)/(9 - 7) m/s
= (4/2) m/s
= 2 m/s-1
APPEARS IN
RELATED QUESTIONS
During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108m s−1.
Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging?
- from A to B and
- from A to C?
What do the following measure in a car ?
(a) Speedometer (b) Odometer
Name the physical quantity which gives us an idea of how slow or fast a body is moving.
Arrange the following speed in increasing order (keeping the least speed first):
An athlete running with a speed of 10 m/s.
The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. How fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey ?
The diagram below shows the pattern of the oil on the road at a constant rate from a moving car. What information do you get from it about the motion of the car.
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is velocity of the car?
A car is moving with a velocity 20 m s-1. The brakes are applied to retard it at a rate of 2 m s-2. What will be the velocity after 5 s of applying the brakes?
Define average velocity and give one example.
