CBSE Class 11-Physics: Kinematics Problems: Questions and Answers-Part 2 (For CBSE, ICSE, IAS, NET, NRA 2023)
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Question 1:
A particle moves in a straight line according to the relation
Find the acceleration of the particle at displacement equal to zero.
Solution
We need to make use of differential calculus in such question. So, acceleration can be finding out like this
So, it is clear, we can find acceleration if we know the value of .
Now we need to find the value of t where .
So
so,
So, displacement becomes zero at these value of
Now acceleration can be finding out by the using the above derived equation
So, at
Question:
Which of the following remain constant during the motion of a projectile fired from a planet?
A) Kinetic energy
B) Momentum
C) Vertical component of velocity
D) Horizontal component of velocity
Solution (d)
Momentum
Since acceleration due to gravity acts during the motion, velocity of the body changes through-out the motion.
So and momentum changes
Now Acceleration due to gravity acts in vertical direction, so vertical component of velocity changes
Since there is no horizontal acceleration, horizontal components remain constant
Graphical question
Explain the acceleration during the motion