Select ALL the correct answers. Two metal balls are dropped from the top of a two-story building at the same time. One ball is twice as heavy as the other ball. Which statement about their motion are true? Assume that air resistance isn’t a factor.

1.)The balls fall with constant velocity.

2.)The balls fall with constant acceleration.

3.)The velocity of the heavier ball is twice that of the lighter ball.

4.)The balls land at the same time.

Statements 2 and 4 are correct. The velocity changes because the initial velocity is zero and each second they gain 9.8 m/s of velocity, which is the constant acceleration. Because there is no air resistance, they will land at the same time, and gravity acts equally upon both objects, so the velocity of both metal balls should always be the same.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.