A10 foot rope ladder hangs over the side of a boat with the bottom rung on the surface of the water. the rungs are one foot apart, and the tide goes up at the rate of 6 inches per hour. how long will it be until three rungs are covered

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)