A 47.4 kg student runs down the sidewalk and jumps with a horizontal speed of 4.2 m/s onto a stationary skateboard. The student and skateboard move down the sidewalk with a speed of 3.95 m/s. How fast would the student have to run initially to have a final speed of 5.0 m/s?

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

Observations show that interstellar clouds can have almost any shape and