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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Analyzing
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Two identical spheres move in opposite directions with speeds and and pass behind an opaque screen where they may either cross without touching (event 1 ) or make an elastic head-on collision (event 2) -
View answer and explanation
Correct option: A
We can never make out which event has occurred
Option A is correct because due to the conservation of momentum and the identical nature of the spheres, we cannot distinguish between crossing without touching and an elastic head-on collision.
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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.