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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Application
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A box of mass is initially at rest on a horizontal surface. A constant horizontal force of is applied to the box directed to the right. The coefficient of friction of the surface changes with the distance pushed as where is the distance from the initial location. For what distance is the box pushed until it comes to rest again?
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Correct option: B
Option B () is correct because the box comes to rest when the work done by the applied force equals the work done by friction.
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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.