Back to WORK-ENERGY-POWER
JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
1 of 1
Understanding
+4 | -1
A ball of mass collides with a wall with speed
and rebounds on the same line with the same
speed. If mass of the wall is taken infinite at rest,
then work done by the ball on the wall is
and rebounds on the same line with the same
speed. If mass of the wall is taken infinite at rest,
then work done by the ball on the wall is
View answer and explanation
Correct option: C
Zero
Option C (Zero) is correct because the wall is infinitely massive and at rest, so it does not move during the collision, and therefore no work is done on the wall.
More Questions from WORK-ENERGY-POWER
Practice All Chapter MCQs →
A ball throwing cannon, lifts ball and throws with Speed. If balls are raised upto . then find Input power of cannon if it lifts 8 balls per minute and its efficiency is . Mass of each ball is .
Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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.
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.