Newton's first law of motion states that an object remains at rest unless a(n) force acts on it. a. balanced c. gravitational b. frictional d. unbalanced select the best answer from the choice

It is an unbalanced force.

The answer is d. Unbalanced

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.