Explain whether the following particles do or do not have an acceleration; (s) a

Question

Explain whether the following particles do or do not have an acceleration; (s) a particle moving in a straight line with constant speed and (b) a particle moving around a curve with constant speed. A ball is projected horizontally from the top of a building. One second later, another ball is projected horizontally from the same point with the same velocity. (a) At what point in the motion will the balls be to each other? (b) Will the first ball always be faster than the seconds? (c) What will be the time difference between them when the balls hit the ground? (d) Can the horizontal projection velocity of the second ball be changed so that the balls arrive at the ground at the same time?

Explanation / Answer

(a) There is no mechanical force act on the projectile after launching, hence it is a freely falling body

(b) The projectile will be pulled downward direction due to gravity, hence it has vertical accelaration 9.8m/s2 in downward direction

(c) The projectile has constand velocity in horizontal direction hence accelaration is zero in horizontal direction

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