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9. A cricket ball is dropped from a height of 20 metres.(a) Calculate the speed of ball when it hits the ground.(b) Calculate the time it takes to fall through this height. (g 10 m/s)

Answer» <p>Initial velocity is 0 .. ( since it is just dropped)</p><p>now using V²= u² +2gh =&gt; (Vfinal)² = 0+2*10*20=&gt; v² = 20*20 = 400=&gt; v = √400 = 20m/s</p><p>for time takenuse V = u+gt =&gt; t = V/g = 20/10 = 2sec</p>


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