A child pulls a sled up a snow covered hill. The child does 405 j of work on the sled. If the child walks up 15 m up the hill, how large of a force must the child exert

Debris produced by mining is called

Matter that emits no light at any wavelength is called

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.)