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1 A 10 kilogram ball rolls down a stair case from a 20 m second...

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1 A 10 kilogram ball rolls down a stair case from a 20 m second floor and reached the ground after 1 sec a Solve for kinetic energy at 2 sec Su A v 4t at V 0 10x1 v 10 m s at I see when it reaches ground 10 m s 2 x 15 x 100 500 Joule b Solve for potential energy Potential energy mgh m 10 kg 9 h 10 m s 20 m mgh 10x10x26 After 2 sec velocity so K E 2 2 x mu c Solve for total mechanical energy when the time is 0 sec V 2660 Jouk

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