The skier leaves from point A from rest and slides on the frictionless track AB, then he continues his motion on the track BCD; under the action of a frictionless force of constant magnitude = ; to stop at D. Consider the skier to be a point object during its motion. Given: g = 10 m/s2 .

Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery