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Question 40: A stone is dropped from a height of 20 m. (i) How long will it take to reach the ground ? (ii) What will be its speed when it hits the ground ? (g =10 m/s2) Lakhmir Singh Physics Class 9

Answer»

Given u = 0 m/sg = 10 m/s^2h = 20 mNow USING s = ut + 1/2 at^2that is H = ut + 1/2 gt^2Now substitute the value 20 = 0*t + 1/2 * 10 (t)^220 = 5(t)^2(t)^2 = 4t = 2sNow again using V = u + ATV = 0 + 10 * 2 V =20 m/sPlease MARK as brainliest



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