You push yourself on a skateboard with a force of 30 N east and accelerate at 0.5 m/s2. East. Find the mass of the skateboard if your mass is 58 kg.

What are atoms of the same element with varying number of neutrons

How can waves travel through ground?

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.