(b)A stone is dropped from the edge of the roof.
(i) How long does it take to fall 19.6m?
Answers
Answered by
2
Answer:
Acceleration is 9.8 m / s ^2 at any time. v = 19.6 m/s. Time to fall is. Distance /speed = 19.8 / 9.8 = 2 second.
Answered by
2
Explanation:
due to gravity is 9.81m per second, per second. The instantaneous vertical velocity is calculated as 9.81 * t (the time from the start) The distance the object has fallen in this time is the integral over time: Distance = 1/2 * 9.81 * t * t for your question we equate this to 19.6m
By transforming this equation we get: t = squareroot of (2 * 19.6 / 9.81) = 2seconds
The acceleration will be 9.81 from start to end since we remain always very near the surface.
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