Question

2kg mass has a kinetic energy of 1 joule when its speed is(a) 0.45 m/s(b) 1 m/s(c) 1.4 m/s(d) 0.45 m/s

Answer 1

Answer:

The speed of the mass 2 kg will be 1 m/s

Explanation:

Given, the mass  = 2 kg, the kinetic energy = 1 joule

As kinetic energy = $\frac{1}{2} mv^{2}$

                         1   = $\frac{1}{2} *2*v^{2}$

                         1 = $v^{2}$

                       $\sqrt{1} = v$

                        1 m/s = v

Hence the answer will be option (a) 1m/s