Aball a is thrown vertically upward from the top of a 28-m-high building with an initial velocity of 4 m/s. at the same instant another ball b is thrown upward from the ground with an initial velocity of 20 m/s. part a determine the height from the ground at which they pass. express your answer to three significant figures and include the appropriate units hvalue units submit request answer part b determine the time at which they pass express your answer to three significant figures and include the appropriate units

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

What are the factors that affect the resistance of a wire?