Question

Find the velocity of a body of mass 100g having a kinetic energy of 20j.

Answer 1

as we know that. 100g=0.1kg
kinetic energy =1/2mv^2
20=1/2*0.1*v^2
v^2=20*2/0.1
v^2=40/0.1
v^2=400/1=400m/s
v=20m/s.
therefore velocity will be 20m/s.
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Answer 2

find the velocity of the body of mass 100 g having a kinetic energy of 20J