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Work and energy Part 4: Interconversion of energies, An object falling down in the presence and absence of friction, An object thrown upwards in the presence and absence of friction
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- Question 1 of 20
1. Question
1 point(s)A ball of mass 2 kg is dropped from the height of a 45 m. The kinetic energy of the body just before it hits the ground is:
CorrectIncorrect - Question 2 of 20
2. Question
1 point(s)A ball of mass 2 kg is dropped from the height of a 45 m. The velocity of the body just before it hits the ground is:
CorrectIncorrect - Question 3 of 20
3. Question
1 point(s)A body of mass 2 kg falls from the height of 5m. What is its velocity when it is 3m from the ground?
CorrectIncorrect - Question 4 of 20
4. Question
1 point(s)An object of mass 3 kg falls from a height of 10 m to a height of 5 m. What is the sum of its kinetic energy and potential energy at 5m?
CorrectIncorrect - Question 5 of 20
5. Question
1 point(s)A body of mass 2kg is dropped from a height of 80 m. It falls on the ground with a speed of 30m/sec. What is the magnitude of work done against friction?
CorrectIncorrect - Question 6 of 20
6. Question
1 point(s)A body of mass 2kg is dropped from a height of 80 m. It falls on the ground with a speed of 30m/sec.
What is the magnitude of frictional force?CorrectIncorrect - Question 7 of 20
7. Question
1 point(s)A car of mass 100 kg is traveling on a road of frictional coefficient 0.4. It gains a speed of 4m/sec in 2.5 seconds . What is the work done by the engine?
CorrectIncorrect - Question 8 of 20
8. Question
1 point(s)A mass of 5 kg is dropped from a certain height. When it reaches the bottom, its velocity is 10m/sec. What is the height?
CorrectIncorrect - Question 9 of 20
9. Question
1 point(s)A body is dropped from 20m height. If its potential energy is 1000 J, then calculate the velocity with which it falls on the ground?
CorrectIncorrect - Question 10 of 20
10. Question
1 point(s)An object of mass 5kg having a potential energy of 1000 J falls from a certain height. Find its velocity when it reaches the ground?
CorrectIncorrect - Question 11 of 20
11. Question
1 point(s)In a freely falling system, if the potential energy and kinetic energy are equal, then friction will be:
CorrectIncorrect - Question 12 of 20
12. Question
1 point(s)A ball is thrown upwards in the presence of air resistance. What time will it take the ball to reach the top as compared to when it is thrown without air resistance?
CorrectIncorrect - Question 13 of 20
13. Question
1 point(s)A ball is dropped in the presence of air friction. What time will it take to reach the ground compared to when it moves with negligible air resistace?
CorrectIncorrect - Question 14 of 20
14. Question
1 point(s)A 40N object has fallen 4m and is 6m above the ground. Its kinetic energy in joules will be:
CorrectIncorrect - Question 15 of 20
15. Question
1 point(s)A 1kg mass has a kinetic energy of 1J. What is its velocity?
CorrectIncorrect - Question 16 of 20
16. Question
1 point(s)An object at height h having energy mgh is allowed to fall freely. What is its energy at the midpoint of its motion?
CorrectIncorrect - Question 17 of 20
17. Question
1 point(s)A body of mass 5kg is thrown vertically upwards with a velocity of 40m/sec. How much distance will be covered in last second?
CorrectIncorrect - Question 18 of 20
18. Question
1 point(s)In upwards motion of a body, the acceleration due to gravity and acceleration due to friction are:
CorrectIncorrect - Question 19 of 20
19. Question
1 point(s)Which of the following quantities will give a graph of decreasing slope for a falling body when plotted against time?
CorrectIncorrect - Question 20 of 20
20. Question
1 point(s)The ratio of acceleration by which an object is moving upwards under air resistance and acceleration due to gravity is:
CorrectIncorrect