a stone is dropped from the edge of a roof, how long does it take to fall 4.9 m. how does it move at the end of 7.9 m. what is its after 1 second and 2 seconds
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Answer:
h = 19.6 m
u = 0
h = u t + 1/2 g t * t
19.6 = 0 + 1/2 * 9.8 * t * t as g = 9.8 m/s/s
t = 2 sec. it takes 2 sec.
acceleration is always the same : g = 9.8 m/sec
velocity / speed at t = 2 sec is = u + g t = 0 + 9.8 * 2 sec = 19.6 m/sec
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