Question

14. (a) 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 average speed t = 0.5 s ?
iii) calculate the height of window from the ground

NO INCORRECT ANSWERSS​

Answer 1

Answer:(a)We know momentum p=mv where m= mass and v=velocity,So rate of change of momentum Δp=mv−mu where v and u are the final and initial velocity.So rate of change of momentum= tm(v−u) --------(A)Also we know acceleration a= tv−u Again ForceF=maThus A can be written as Fα tm(v−u) F=kma where k= proportionality constant.Hence from second law of motion we get force is the product of mass and acceleration.F=ma(b)(I)4.9m/s(ii)2.45m/s(iii)1.225m

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