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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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The velocity vector of a sphere after it hits a vertical wall which is parallel to is on a smooth horizontal surface. The coefficient of restitution between ball and wall is (1/2). Find the velocity vector of sphere immediately before collision.
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Correct option: D
Option D () is correct because the component of velocity parallel to the wall remains unchanged, and the perpendicular component is reversed and scaled by the coefficient of restitution.
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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.