Question

4. In case of vertically projected body : [ ]

a) Potential energy decreases b) Potential energy increases

c) Kinetic energy decreases d) both b and c

5. A person holding a 5 kg of suitcase and waiting for the bus. The work done will be: [ ]

a) 59 J b) 5 J c) 0 J d) 0. 5 J

6. A body is displaced by 20 m, when a force of 20 N acts on the body. The work done is: [ ]

a) 20 J b) 200 J c) 400 J d) 40 J

7. A body of 10 kg is falling from the height of 50 m under the influence of gravitational force. Then

the work done is (g = 10 ms–2) : [ ]

a) 500 J b) 50 J c) 5000 J d) 5 J

8. Work done by an applied force of 20 N on a body moving on a rough horizontal plane with a

uniform velocity of 20 ms–1 in one second is : [ ]

a) 40 J b) 0 J c) 400 J d) 20 J

9. A force of 10 N acts on a body of mass 1 kg at rest. The work done by the force through a

distance of 80 m is : [ ]

a) 80 J b) 800 J c) 8 J d) 8000 J

10. As a body rolls down on an inclined plane, it has : [ ]

a) only kinetic energy b) only potential energy

c) both kinetic energy and potential energy d) neither kinetic energy nor potential energy​

Answer 1

Explanation:

5. A person holding a 5 kg of suitcase and waiting for the bus. The work done will be:-d) 0. 5 J

6. A body is displaced by 20 m, when a force of 20 N acts on the body. The work done is: [ ],-c) 400

7. A body of 10 kg is falling from the height of 50 m under the influence of gravitational force. Then-) 5000