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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Medium
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Analyzing
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The kinetic energy of particle continuously increase with time
a. The resultant force on the particle must parallel to velocity at all instants
b. The resultant force on the particle at an angle less than all the time
c. Its height above the ground level continuously decrease
d. The magnitude of its linear momentum is increasing continuously
a. The resultant force on the particle must parallel to velocity at all instants
b. The resultant force on the particle at an angle less than all the time
c. Its height above the ground level continuously decrease
d. The magnitude of its linear momentum is increasing continuously
View answer and explanation
Correct option: D
b, d are correct
Option D is correct because if the kinetic energy of a particle continuously increases, the resultant force must have a component along the velocity (angle less than 90 degrees), and the magnitude of its linear momentum increases continuously.
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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.