Question

a stone of mass 2kg is falling from rest the top of a steep Hill what will be its kinetic energy after 5 seconds​

Answer 1

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Energy due to the motion of a body is called kinetic energy.

m=2Kg, t=5 s Velocity after 5 s(v)=0+ 10x5=50 m/s

Therefore K.E.=1/2 x 2 x (50)2 =2500 joule=2.5 KJ.