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प्रश्न
Define velocity. What is the SI unit of velocity ?
उत्तर
Velocity of a body is the distance travelled by it per unit time in a given direction. SI unit of velocity is m/s. It is a vector quantity .
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संबंधित प्रश्न
Name the physical quantity whose SI unit is :
(a) m/s (b) m/s2
Fill in the following blank with suitable word :
If a body moves with uniform velocity, its acceleration is ..............
Explain the meaning of the following equation of motion :v = u + at, where symbols have their usual meanings.
A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration.
A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
For a uniformly retarded motion, the velocity-time graph is _____________
How can you find the following?
Velocity from acceleration – time graph.
A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial position. Her displacement–time graph is shown in Fig.8.4. Plot a velocity-time graph for the same.
An electron moving with a velocity of 5 × 104 ms−1 enters into a uniform electric field and acquires a uniform acceleration of 104 ms–2 in the direction of its initial motion.
(i) Calculate the time in which the electron would acquire a velocity double of its initial velocity.
(ii) How much distance the electron would cover at this time?
