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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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A certain spring is found not to obey Hooke's law, it exerts a restoring force if it is stretched or compressed, where and The mass of the spring is negligible. An object with mass on a frictionless, horizontal surface is attached to the spring, pulled a distance to the right to stretch the spring and released. The speed of the object when it is to the right of the equilibrium position is
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Correct option: A
Option A () is correct because it is calculated using conservation of energy, considering the non-Hookean restoring force.
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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.