Advertisements
Advertisements
प्रश्न
A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:
How long does it take to travel 240 m ?
उत्तर
(d) We have:
Distance (d) = 240 m
Speed (v) = 30 m/s
We can find the time as :
`"Time" = "Distance travelled"/"Speed"`
So ,
t = `240/30` s
= 8 s
APPEARS IN
संबंधित प्रश्न
Under which condition is the magnitude of average velocity equal to average speed ?
Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which
bus travels faster ?
Write the formula for acceleration. Give the meaning of each symbol which occurs in it.
A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h ?
If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?
Give one example of a motion where an object does not change its speed but its direction of motion changes continuously.
The graph given alongside shows how the speed of a car changes with time:
(i) What is the initial speed of the car ?
(ii) What is the maximum speed attained by the car ?
(iii) Which part of the graph shows zero acceleration ?
(iv) Which part of the graph shows varying retardation ?
(v) Find the distance travelled in first 8 hours.
A car travels the first 30 km with a uniform speed of 60 km h-1 and the next 30 km with a uniform speed of 40 km h-1. Calculate :
The total time of journey,
The average speed of the car.
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.
Distinguish between speed and velocity.