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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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I. In elastic collision, initial kinetic energy is equal to the final kinetic energy.
II. In elastic collision, kinetic energy during the collision time is constant.
Which of the following statement(s) is/are correct?
II. In elastic collision, kinetic energy during the collision time is constant.
Which of the following statement(s) is/are correct?
View answer and explanation
Correct option: A
Only I
Option A (Only I) is correct because in an elastic collision, the total kinetic energy before and after the collision is the same, but during the collision, kinetic energy is temporarily converted to potential 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.