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प्रश्न
Define acceleration.
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उत्तर
Acceleration of a body is rate of change of its velocity with respect to the time.
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संबंधित प्रश्न
A train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the retardation.
A space craft flying in a straight course with velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km s-1 in the same direction.
Find
(i) The space craft's average acceleration while the motors were firing
(ii) The distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors being in action for only 6 s.
A car travels with uniform velocity of 25 m s-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s. Find:
- The distance which the car travels before the brakes are applied,
- Retardation and
- The distance travelled by car after applying the brakes.
A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km/h. After 2 s, it is 33.6 km/h, and after further 2 s, it is 37.2 km/h. Find the acceleration of the vehicle in m s-2. Is the acceleration uniform?
Explain the following concept in your own words with everyday examples:
Acceleration
A motor bike running at 5 ms−1, picks up a velocity of 30 ms−1 in 5s. Calculate
- acceleration
- distance covered during acceleration.
Correct your friend who says that acceleration gives the idea of how fast the position changes.
When a body starts from rest, the acceleration of the body after 2 seconds in ______ of its displacement.
If a body starts from rest, what can be said about the acceleration of the body?
What is the difference between uniform acceleration and non–uniform acceleration?
