If an object has a kinetic energy of 30 j and mass of 34kg how fast is the object moving?

Since the formula for kinetic energy is:

Ek = (m*V^2) / 2 where m is mass and V is speed, then we can take this equation and manipulate it a little to isolate the speed.

Ek = mv^2 / 2 - multiply both sides by 2

2Ek = mv^2 - divide both sides by m

2Ek / m = V^2 - switch sides

V^2 = 2Ek / m - plug in values

V^2 = 2*30J / 34kg

V^2 = 60J/34kg

V^2 = 1.76 m/s - sqrt of both sides

V = sqrt (1.76)

V = 1.32m/s (roughly)