A ball of mass 045 kg hangs straight down on a string of


A ball of mass 0.45 kg hangs straight down on a string of length 12 cm. It is then swung upward, keeping the string taut, until the string makes an angle of 550 with respect to the vertical. Find the change in the gravitational potential energy of the Earth-ball system.

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Physics: A ball of mass 045 kg hangs straight down on a string of
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