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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Consider a one-dimensional motion of a particle with total energy . There are four regions and in which the relation between potential energy , kinetic energy and total energy is as given below:
Region
Region
Region
Region
Which of the following regions the particle cannot be found?
Region
Region
Region
Region
Which of the following regions the particle cannot be found?
View answer and explanation
Correct option: A
Region
Option A is correct because the particle cannot exist in a region where the potential energy is greater than the total energy (V > E), as this would result in negative kinetic energy.
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Reason: Angular displacement is not an axial vector. A body of mass thrown vertically upwards attains a maximum height . As what height will its kinetic energy be of its initial value? Assertion: Centripetal force does no work.
Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.
Statement II: Work done against restoring force is stored as potential energy. A bullet of mass moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.