Final answer:
The object must reach a speed of approximately 30 m/s to have a kinetic energy of 450 J.
Step-by-step explanation:
The kinetic energy of an object can be calculated using the formula K = 1/2mv², where K is the kinetic energy, m is the mass, and v is the velocity. In this case, we have a mass of 1 kg and a desired kinetic energy of 450 J. Plugging in the values for m and K into the formula, we can solve for v.
K = 1/2mv²
450 J = 1/2 (1 kg) v²
v² = 900 J/kg
v ≈ 30 m/s
Therefore, the object must reach a speed of approximately 30 m/s to have a kinetic energy of 450 J.