Question

a body of mass 1 kg has a kinetic energy of 1 joules when its speed is

Answer 1

hey dear
here is your answer

kinetic energy = 1/2*mass*velocity^2
1 = 1/2*1*velocity^2
velocity^2 = 2km/h
velocity = 1.41

hope it helps :)

Answer 2

Howdy!!

your answer is ----

Given, mass m = 1kg , kinetic energy k = 1j

according to formula ,

$k = \frac{1}{2} m {v}^{2} \\ = > 1 = \frac{1}{2} \times 1 \times {v}^{2} \\ = > {v}^{2} = 2 \\ = > v = \sqrt{2} = 1.414m {s}^{ - 1}$

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hope it help you