17. a 60.-kilogram student climbs a ladder a vertical distance of 4.0 meters in 8.0 seconds. approximately how much total work is done against gravity by the student during the climb?

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Positrons are spontaneously emitted from the nuclei of