A golfer hits a ball and gives it an initial velocity of 40 m/s , at an angle of 30 degrees above the horizontal. a. How long did the ball stay in the air?

b. How far horizontally did the ball travel before hitting the ground?

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

In an experiment, how can i change human errors? be specific.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.