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प्रश्न
Distinguish between acceleration and retardation.
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उत्तर
Acceleration is the increase in velocity per second, while retardation is the decrease in velocity per second. Thus, retardation is negative acceleration. In general, acceleration is taken positive, while retardation is taken negative.
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संबंधित प्रश्न
Define acceleration. State its unit.
The velocity-time graph for a uniformly retarded body is a straight line inclined to the time axis with an obtuse angle. How is retardation calculated from the velocity-time graph?
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 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.
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
Define acceleration.
A car is moving with a speed of 50 km/h. One second later, its speed is 55 km/h. What is its acceleration?
From the given v-t graph it can be inferred that an object is
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?
