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a 1000kg wrecking ball hangs from a 15 m long cable. The ball is pulled back until the cable makes an angle of 25 degrees within the vertical. By how much has the gravitational potential energy of the ball changed?
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Added Tue, 21 Jul '15
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Change in height=Length(1-cos ?)
                                =15(1-cos 25)
                                =1.41 m

Change in potential energy= mgh
                                              =1000*9.8*1.41
                                               =13772.8 J
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