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प्रश्न
What do you mean by constant acceleration?
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उत्तर
A body is said to have constant acceleration, if it travels is a straight line and its velocity increases or decreases by equal magnitude in equal intervals of time.
Ex: the motion of a freely falling body.
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संबंधित प्रश्न
What is meant by the term retardation? Name its S.I. unit.
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 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?
When is the acceleration due to gravity negative?
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.
From the diagram given below, calculate deceleration.
From the velocity – time graph given below, calculate deceleration in region BC.
A truck running at 90 kmh−1, is brought to rest over a distance of 25 m. Calculate the retardation and time for which brakes are applied.
The speed of a car increases from 10 km/h to 64 km/h in 10 seconds. What will be its acceleration?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
Sketch the shape of the velocity-time graph for a body moving with:
Uniform acceleration.
The rate of change of velocity is ______.
A car starts from rest and it is travelling with a velocity of 20 m/s in 10 s. What is its acceleration?
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
The slope of a velocity-time graph gives ______.
The acceleration of the body that moves with a uniform velocity will be ______.
A quantity has a value of 16ms-2. It is the ______.
