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प्रश्न
Distinguish between speed and velocity.
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उत्तर
| Speed | Velocity | |
|
1. |
Speed is simply the rate of change of motion. or simply, it is the distance travelled by a body in a unit of time. |
Velocity is direction-aware, and it is the rate of change of position of an object. |
| 2. | Speed is a scalar quantity, i.e. it has only magnitude. | Velocity is a vector quantity, i.e. it has both magnitude and direction. |
| 3. | Speed measures the distance travelled (d) over the change in time (Δt). | Velocity measures displacement (or change in position, Δs) over the change in time (Δt). |
|
4. |
Speed = `"Distance"/"time"` = dt |
Velocity = `"Displacement"/"Time"` = st |
| 5. | Speed ascertains how fast a body moves. | Velocity ascertains the object's speed and the direction it takes while moving. |
|
6. |
Example: A person is making a roundabout journey at a speed of 30 mph. |
Example: A woman plans to drive her car at 56 mph in East Mumbai. |
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संबंधित प्रश्न
Name the physical quantity which gives us an idea of how slow or fast a body is moving.
State whether speed is a scalar or a vector quantity. Give reason for your choice.
Convert a speed of 54 km/h into m/s.
A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.
Express the following in m s-1.
18 km min-1
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.
A train travels with a speed of 60 km h-1 from station A to station B and then comes back with a speed 80 km h-1 from station B to station A. Find -
- The average speed
- The average velocity of the train.
A body moves from rest with uniform acceleration and travels 270 m in 3 s. Find the velocity of the body at 10 s after the start.
Define average velocity and give one example.
Write down the type of motion of a body along with the A – O – B of the following distance – time graph.
