Buks, mass 50 kg, moves at a velocity of 4 m·s-'in an easterl direction on his skateboard of mass 5 kg.
When he passes underneath a tree, his cat, mass 10 kg, drops
from a branch into his arms.
Calculate the velocity of Buks, the cat and the skateboard
together after he catches his cat​

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant