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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Medium
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Which of the following is true:
Statement A: A particle is moving with constant speed must have constant velocity also.
Statement B: If velocity of a particle is zero then its acceleration may not be zero.
Statement A: A particle is moving with constant speed must have constant velocity also.
Statement B: If velocity of a particle is zero then its acceleration may not be zero.
View answer and explanation
Correct option: C
Only A is wrong
Option C (Only A is wrong) is correct because a particle moving with constant speed can have changing velocity (e.g., circular motion), and zero velocity doesn't imply zero acceleration.
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Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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.
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.