A 100 gram apple falls from a branch that is 2.5 meters above the ground. -How much time elapses before the apple hits the ground? -Just before the impact, what is the speed of the apple? Please explain.
time to fall t = (2h/g) ^1/2
= (2 * 2.5 /9.8)^ 1/2
= 0.714 s
speed of the apple after reaching the ground v = vo + gt = 0 + gt = gt
v = 9.8 * 0.714
= 7 m/s
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