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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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A bullet of mass 10 Gm strikes a target at 400 m/s velocity and loses half of its initial velocity. The loss of kinetic energy in joules is
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Correct option: D
600
Option D (600) is correct because the loss of kinetic energy is calculated using the formula ΔKE = (1/2)m[V₁² - V₂²].
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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.