State Newton’s second law of motion and show that the first law of motion can be
mathematically stated from the mathematical expression for the second law of motion.
(b) A stone dropped from a window reaches the ground in 0.5 seconds (given g = 10 ms–2).
(i) Calculate the speed just before it hits the ground.
(ii) What is the average speed at t = 0.5 s?
(iii) Calculate the height of window from the ground.
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Answer:
A) For a constant mass m, Newton's second law looks like: F = m * (V1 - V0) / (t1 - t0) The change in velocity divided by the change in time is the definition of the acceleration a. The second law then reduces to the more familiar product of a mass and an acceleration: F = m * a.
ii) F = ma
F = m(v-u)/t
Ft = mv-mu
Now, When F = 0 , v = u , this means that the object will remain at rest.
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Explanation:
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