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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Understanding
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A) When a ball hits a wall (stationary) it returns back with same velocity, if collision is elastic
B) A ball hits a bus moving towards it. If the collision is inelastic, they move together.
C) Inelastic collision arises due to loss in K.E during collision
B) A ball hits a bus moving towards it. If the collision is inelastic, they move together.
C) Inelastic collision arises due to loss in K.E during collision
View answer and explanation
Correct option: C
A, B, C are true
The correct answer is C because all three statements (A, B, and C) accurately describe aspects of collisions: elastic collisions, inelastic collisions, and energy loss.
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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.