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Question:

A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed (in m/s) of the particle is zero, the speed (in m/s) after 5 s is :

Solution:

Power=Wt ⇒ W=0.5×5=2.5=KEf−KEi
2.5=M/2(vf²−vi²)
⇒vf=5