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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Two moving particles collide and stick together on a smooth horizontal surface. The following statements are given below
(a) Mechanical energy is conserved.
(b) Total energy is conserved.
(c) Work done by the system is positive
(d) Work done by the system is negative.
Choose the correct option.
(a) Mechanical energy is conserved.
(b) Total energy is conserved.
(c) Work done by the system is positive
(d) Work done by the system is negative.
Choose the correct option.
View answer and explanation
Correct option: D
(b) and (d) are correct.
Option D ((b) and (d) are correct) is correct because total energy is always conserved, but mechanical energy is not conserved in an inelastic collision, and the work done by the system is negative.
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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.