MEDIUM
11th ICSE
IMPORTANT
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A bullet of mass 20 g moving with a speed of 150 ms-1 strikes a block and comes to rest after piercing 10 cm into it. Find the average force of resistance offered by the block.

Important Questions on Work, Power and Energy

MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 14
Two identical 5kg blocks are moving with the same speed of two meters per second towards each other along a frictionless horizontal surface. The blocks collide, stick together and come to rest. Considering the two blocks as a system, calculate the work done by external forces.
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 14
Two identical 5kg blocks are moving with the same speed of two meters per second towards each other along a frictionless horizontal surface. The blocks collide, stick together and come to rest. Considering the two blocks as a system, calculate the work done by internal forces.
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 15
A ball is dropped from rest at a height of 60 m. On striking the ground, it loses 25% of its energy. To what height does it rebound?
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 16
A 10 kg body is dropped from a height of  20 m. What is its potential energy before dropping? What is its kinetic energy when it is 8.0 m high above the ground? What is its kinetic energy when it hits the ground? g=9.8 ms-2
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 17
A spring requires 4J of work to be stretched through 10cm. Find the spring-constant.
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 18
A block of mass 2 kg is dropped from a height of 40 cm on a spring whose force constant is 1960 N/m. What will be the maximum compression x of the spring?g=9.8 ms-2
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 19
A solid of mass 2 kg moving with velocity 10 m/s strikes an ideal weightless spring and produces a compression of 25 cm in it. Calculate the force constant of the spring.
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 20

A bullet of mass 20 g strikes a block of mass 980 g with a velocity v and is embedded in it. The block is in contact of a spring whose force-constant is 100 N/m. After the collision the spring is compressed up to 10 cm.

Find the velocity of the block after the collision.

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