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[" 20.A stone is tied to a string of len...

[" 20.A stone is tied to a string of length "ell" and is whirled in a "],[" vertical circle with the other end of the string as the centre."],[" At a certain instant of time,the stone is at its lowest position "],[" and has a speed u.The magnitude of the change in velocity "],[" as it reaches a position where the string is horizontal "],[" (g being acceleration due to gravity) is "],[[" (a) "sqrt(2g ell)," (b) "sqrt(2(u^(2)-g ell))],[" (c) "sqrt(u^(2)-g ell)," (d) "u-sqrt(u^(2)-2g ell)]]

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