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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Analyzing
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1. During any collision, velocity along common tangent doesn’t change.
2. In an elastic collision with equal masses, the velocity along common normal is interchanged.
3. When a ball makes an oblique inelastic collision with a fixed target the reflection angle is less than incidence.
4. In a one dimensional elastic collision the fraction of kinetic energy transferred by a projectile to a stationary target is .
2. In an elastic collision with equal masses, the velocity along common normal is interchanged.
3. When a ball makes an oblique inelastic collision with a fixed target the reflection angle is less than incidence.
4. In a one dimensional elastic collision the fraction of kinetic energy transferred by a projectile to a stationary target is .
View answer and explanation
Correct option: A
Only 3 is wrong
Option A is correct because in an inelastic collision with a fixed target, the reflection angle is greater than the incidence angle.
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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.