18. In each of the following a force, F is acting on an object ofmass, m The direction of displacement is from west to eastmoving ashown by the longer arrow. Observe the diagrams carefullyand state whether the work done by the force is negative,positive or zero.19. Soni says that the acceleration in an object could be zeroeven when several forces are acting on it. Do you agree withher? Why?20. Find the energy in kW h consumed in 10 hours by fourdevices of power 500 W each.21. A freely falling object eventually stops on reaching theground. What happenes to its kinetic energy?

18. In each of the following a force, F is acting on an object ofmass,

1.	18. In each of the following a force, F is acting on an object ofmass, m The direction of displacement is from west to eastmoving ashown by the longer arrow. Observe the diagrams carefullyand state whether the work done by the force is negative,positive or zero.19. Soni says that the acceleration in an object could be zeroeven when several forces are acting on it. Do you agree withher? Why?20. Find the energy in kW h consumed in 10 hours by fourdevices of power 500 W each.21. A freely falling object eventually stops on reaching theground. What happenes to its kinetic energy?
Answer» I this u have to RUN ad ur NCERT then u FIND all ANS

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