Work, Energy and Power

---

Question

---

Question 1 :

A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platform from where the took the jump the total work done by the man at the instant he lands is

1. zero
2. 150 J
3. 300 J
4. 600 J
Answer
8245

Question 2 :

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

1. 3.6 J
2. 7.2 J
3. 120 J
4. 1200 J
Answer
8246

Question 3 :

A body of mass 10 kg is traveling with uniform speed of 5 m/s. Its kinetic energy is

1. 1250 J
2. 1000 J
3. 125 J
4. 25 J
Answer
8247

Question 4 :

A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is

1. 100 J
2. -100 J
3. 60 J
4. 392 J
Answer
8248

Question 5 :

A ball is dropped from a height of 1 m. If the coeffcient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

1. 0.6 m
2. 0.4 m
3. 0.36 m
4. 1 m
Answer
8249