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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
Distinguish between acceleration and retardation.
The unit of retardation is ____________
Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.
(a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason .
(b) Compare the magnitude of acceleration and retardation .
A train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the retardation.
Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car Q between 2 s – 5 s.
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.
A racing car, initially at rest, picks up a velocity of 180 kmh−1 in 4.5 s. Calculate
- acceleration
- distance covered by the car.
The acceleration of a body is 8.5 ms-2. What does this statement mean?
The speed of a car increases from 10 km/h to 64 km/h in 10 seconds. What will be its acceleration?
Out of energy and acceleration, which one is a vector?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
Interpret the following graph:
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Deceleration
Negative acceleration is called ______.
State whether true or false. If false, correct the statement.
Acceleration can get negative value also.
A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
Acceleration is defined as the rate of change of ______.
Assertion: Position-time graph of a stationary object is a straight line parallel to the time axis.
Reason: For a stationary object, the position does not change with time.
