magic 8 ball

A @0N crate starting at rest slides down a rough 5.0m ramp, inclined at 25 degress with the horizontal. 20j of energy is lost due to friction. what will be the speed of the crate at the bottom of the incline? i need some help these one i don't know where...

A 1000kg sports car accelerates from 0 to 25m/s in 7.5s what is the average power delivered by the engine? i know that POWER= W/delta T =Fv but im not sure how to calculate W can someone help me out with this one?

A 3.0m rod is pivoted about its left end. A force of 6.0N is applied perpendicularto the rod at a distance of 1.2m from the pivot causing a ccw torque, and a force of 5.2N is applied at the end of the rod 3.0m fromt eh pivot. The 5.2N is at an angle if 30...