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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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A body of mass 1 kg is projected vertically up with certain velocity. At certain point its P.E. and K.E. are 8 J and 90 J. The maximum height reached by it is
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Correct option: C
10 m
Option C (10 m) is correct because the maximum height is calculated by equating the total energy (PE + KE) at a given point to the potential energy at the maximum height.
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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.