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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Medium
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Application
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The length of an elastic string is when the tension is . Its length is when the tension is . What will be its length, when the tension is ?
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Correct option: B
Option B () is the correct answer because it is derived by setting up equations based on the relationship between tension and length, and then solving for the length when the tension is 9 N.
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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.