1: How much work is done to this spring with a constant of 220 N/m by compressing it 0.65-m? 2: A 67.5 N force was applied was over the course of 5m to a 25kg object traveling at 6.5 m/s. How fast was the object traveling after the force is applied?

3: A -67.5 N force was applied was over the course of 5m to a 25kg object traveling at 6.5 m/s. How fast was the object traveling after the force is applied?

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

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.