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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Analyzing
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Which of the following statement(s) is/are correct?
I. If momentum of a body increases by , its kinetic energy will increase by .
II. Kinetic energy is proportional to square of velocity.
I. If momentum of a body increases by , its kinetic energy will increase by .
II. Kinetic energy is proportional to square of velocity.
View answer and explanation
Correct option: C
Both I and II
Option C (Both I and II) is correct because the kinetic energy increases by 125% when momentum increases by 50%, and kinetic energy is proportional to the square of velocity.
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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.