The 64.4-lb crate slides down the curved path in the vertical plane. if the crate has a velocity of 3 ft/sec down the incline at a and a velocity of 25 ft/sec at b, compute the work uf. done on the crate by friction during the motion from a to b.

1) a child holds two dogs on two separate leads. the dogs are pulling in different directions. one is pulling a force of 20n north and one is pulling 15n eastwards. calculate the resultant force on the child. state the direction. (use the parallelogram of forces) 2) a force of 20n acts horizontally on an object. a second force of 5n acts at 60 degrees to the first one. calculate the resultant force. worth 20 points, need answers asap with method you x