A train, initially stationary, has a constant acceleration of 0.20 m/s^2. (a) Wh

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A train, initially stationary, has a constant acceleration of 0.20 m/s^2. (a) What is its speed after 20 s? (b) What is the total time needed for the train to reach a speed of 25 m/s? 22. An object is thrown vertically upward from the top of a 350 meter building. Its initial speed is 15 m/s. (a) What is the maximum height of the object before falling back toward the ground? (b) What is the velocity of the object right before it hits the ground? 23. Astronomers have observed that the Universe, in general, is a cold, dark place. The average temperature of outer space is roughly 2.7 K. (a) What wavelength EM wave would be emitted most strongly by outer space? (b) Based on this figure, what is the name of this EM wave?

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