A small ball is pushed from a height h along a smooth hemispherical bowl. With what speed should the ball be pushed so that it just reaches the top of the opposite end of the bowl? The height of the top of the bowl is R.

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2gh

2gR

2g(R+h)

2g(R−h)

answer is D.

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Detailed Solution

From the principle of conservation of energy, we have12mv2+mgh=0+mgRwhich gives v=2g(R−h). Hence the correct choice is (d).

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