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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Understanding
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During "elastic collision"
a) There is no loss of kinetic energy
b) The bodies are perfectly elastic
c) Temporarily some of the kinetic energy is used to deform the bodies
d) After collision the bodies regain the original shape keeping the total energy constant
a) There is no loss of kinetic energy
b) The bodies are perfectly elastic
c) Temporarily some of the kinetic energy is used to deform the bodies
d) After collision the bodies regain the original shape keeping the total energy constant
View answer and explanation
Correct option: B
a, b, c, d are true
Option B (a, b, c, d are true) is correct because all the statements accurately describe the characteristics of an elastic 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.