Question

At what speed a body of mass 1 kilogram will have a kinetic energy of 1 joule

Answer 1

We know that,

K.E = 0.5 x m x v²

Here, K.E = 1 J, m = 1 kg, v= ?

Therefore, v² = K.E / 0.5 x m


v² = 1 / 0.5 x 1 = 2

Therefore, v = √2


Hope it Helps!

Answer 2

Answer:

● When it's speed is 1.4m/s

=> $K.E = 1/2 m {v}^2$

=> $1 = 1/2 × 1 × {v}^2$

=> $2 = {v}^2$

=> ${v}^2 = 2$

=> $v = √2$

or

=> $1.4m/s$