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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Application
+4 | -1
A ball rolls off the top of stair-way with a horizontal velocity of magnitude The steps are 0.20 m high and 0.20 m wide. Which step will the ball hit first?
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Correct option: D
Fourth
Option D (Fourth) is correct because the ball will hit the fourth step, calculated by finding the step number using projectile motion equations.
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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.