3. Two parallel forces of 100 N and 40 N act on a body in the same direction from two points A and B at a distance of 0.4 m from each other. Find the magnitude and the point of application of the
resultant of two forces.

Estimate the kinetic energy of mars with respect to the sun as the sum of two terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. (assume mars is a uniform sphere with mass = 6.4×10 to the power of 23 kg, radius = 3.4×10 to the power of 6 m, rotation period = 24.7 hours, orbital period = 686 days and is 2.3×10 to the power of 8 km from the sun.)