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प्रश्न
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
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उत्तर
This means the body has a positive acceleration.
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संबंधित प्रश्न
A train starts from rest and accelerates uniformly at a rate of 2 m s−2 for 10 s. It then maintains a constant speed for 200 s. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 s. Find
- The maximum velocity reached,
- The retardation in the last 50 s,
- The total distance travelled,
- The average velocity of the train.
Explain the following concept in your own words with everyday examples:
Acceleration
A ball is rolling from A to D on a flat and smooth surface. Its speed is 2 cm/s. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become 4 cm/s. It took 2 seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?
An aeroplane lands at 216 kmh−1 and stops after covering a runway of 2 m. Calculate the acceleration and the time, in which it comes to rest.
Write the SI unit of retardation.
Distinguish between uniformly and non-uniformly accelerated motions.
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
A car accelerates to a velocity of 30 m/s in 10 s and then decelerates for 20 s so that it stops. Draw a velocity-time graph to represent the motion and find:
The acceleration.
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
When an object undergoes acceleration ______.
