An object on a straight line travels from point A to point B at a constant speed of 60 kmh-1 and returns to point A at a constant speed of 50 kmh-1. What is the average velocity for total motion? 1) 60 kmh-1
2) 55 kmh-1
3) 52.5 kmh-1
4) 50 kmh-1
5) 0
please help me...

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

State the following: boyle's law and charle's law

Two charged particles, q1 and q2, are located on the x-axis, with q1 at the origin and q2 initially at x1 = 12.2 mm. in this configuration, q1 exerts a repulsive force of 2.62 µn on q2. particle q2 is then moved to x2 = 18.0 mm. what is the force (magnitude and direction) that q2 exerts on q1 at this new location? (give the magnitude in µn.)