Question

A 1-kg object has kinetic energy of 1 J when its speed is:

a) 0.45 m/s
b) 1 m/s
c) 1.4 m/s
d) 4.4 m/s

Answer 1

The correct speed at which the 1-kg object has a kinetic energy of 1 J is approximately 1.41 m/s.

Step-by-step explanation:

Kinetic energy is given by the formula KE = 1/2 mv^2, where m is the mass of the object and v is its velocity.

In this question, we have a 1-kg object with a kinetic energy of 1 J. We can substitute these values into the formula to find the velocity:

1 = 1/2 (1) v^2

v^2 = 2

v = √2

v ≈ 1.41 m/s

Therefore, the correct answer is c) 1.4 m/s.