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प्रश्न
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 .
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उत्तर
(a) The magnitude of acceleration is lower as the slope of line AB is less than that of line CD.
(b) Slope of line AB = vo/t
Slope of line CD = vo/0.5t
Slope of line AB/Slope of line CD = (vo /t)/(vo /0.5t)
Slope of line AB:Slope of line CD :: 1:2.
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संबंधित प्रश्न
State the type of motion represented by the following sketches in Figures.
Give an example of each type of motion.
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.
When is the acceleration due to gravity positive?
Draw velocity – time graph for the following situation:
When a body is moving with variable velocity, but uniform retardation.
From the diagram given below, calculate deceleration.
What does a positive acceleration mean?
What do you mean by constant acceleration?
When a body starts from rest, the acceleration of the body after 2 seconds in ______ of its displacement.
What is meant by negative acceleration?
Assertion: A negative acceleration of a body can be associated with speeding up of the body.
Reason: Increase in the speed of a moving body is independent of its direction of motion.
