Physics-
A body of mass 
is resting on a wedge of angle 
as shown in figure. The wedge is given at acceleration 
. What is the value of a son that the mass just falls freely?
Physics-General
Answer:The correct answer is: The horizontal acceleration 
of the wedge should be such that in time the wedge moves the horizontal distance 
. The body must fall through a vertical distance 
under gravity. Hence,
and 
tan
or 
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The values of satisfying 
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Alternatively, look at the self-illustrative figure.
Alternatively, look at the self-illustrative figure.
The displacement-time graph of a moving object is shown in figure. Which of the velocity-time graphs shown in figure could represent the motion of the same body?
physics-General
Think of the lope of the given displacement-time graph at different points and you would arrive at the correct answer.
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physics-
Which of the following graphs cannot possibly represent one dimensional motion of a particle
I is not possible because total distance covered by a particle increases with time
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
Which of the following graphs cannot possibly represent one dimensional motion of a particle
physics-General
I is not possible because total distance covered by a particle increases with time
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
physics-
Which of the following graphs cannot possibly represent one dimensional motion of a particle
I is not possible because total distance covered by a particle increases with time
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
Which of the following graphs cannot possibly represent one dimensional motion of a particle
physics-General
I is not possible because total distance covered by a particle increases with time
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative
II is not possible because at a particular time, position cannot have two values
III is not possible because at a particular time, velocity cannot have two values
IV is not possible because speed can never be negative